If a sample is thought to be several million years old, which method would best help to determine its absolute age?
A. C-14/C-12
B. Ar-40/K-40
C. Pb-206/U-238
Lipids with high polyunsaturatd fatty acid content are ____________ at room temperature.
Large quantities of tritium were released into the atmosphere in the 1950s and 1960s during atmospheric nuclear testing. This tritium fell back to earth in precipitation. Assume that the precipitation joins runoff that goes directly to an open watershed. Where would you expect to find the tritium next? A. In a closed watershed B. In the atmosphere C. In an iceberg D. In the ocean
Answer: D. In the ocean
A watershed can be defined as regions of land where all surface water drains into the same place. It is a land that is occupied with water drained from interconnected rivers, and lakes. These drainage streams may aggregate in the ocean.
According to the above information the open watershed system likely to dispense off tritium in the ocean because the open watershed water may flow and combine with other reservoirs of water like ocean.
Technetium-99 does not occur naturally, but can be produced from molybdenum-98. what is the missing particle in this nuclear equation?
I believe that the correct nuclear equation is the image that I attached.
From the equation we can see that the number of electrons are balanced out, that is:
42 = 43 – 1
42 = 42
Now what’s left to balance is the mass number,
98 + ? = 99
To complete the gap, we need to fill in 1 neutron so that:
98 + 1 = 99
99 = 99
Answer:
a neutron
Aspirin tablets contain the active ingredient (aspirin) and various inactive ingredients. Suggest what types of inactive ingredient could be present, and what their purpose might be.
Inactive ingredients in aspirin tablets, such as fillers, binders, and buffering agents, help in maintaining the structure of the tablet, extending shelf life, and minimizing side effects, among other functions.
Inactive ingredients in aspirin tablets serve various functions, such as binders, which hold the tablet together, and fillers like starch, which add bulk to the tablet making it easier to handle. Other potential inert ingredients may include disintegrants to help the tablet break down after ingestion, preservatives to extend shelf life, and buffering agents such as MgO, especially in buffered aspirin forms, to minimize acidic side effects. In some cases, there may be coating agents to protect the stomach lining or to control the release rate of the aspirin, flavoring agents to improve taste, and colorants for tablet identification. The choice of these additives depends on the intended use, manufacturing process, and desired properties of the final product.
How do the number of valence electrons an element has change from column to column?
Answer:
Increases by an unit.
Explanation:
The periodic table refers to the table in which the chemical elements are arrangement in the increasing order of their atomic number (Z). This table contains 18 vertical columns, known as groups and 7 horizontal rows, called columns.
As we move across the period, i.e. left to right from one column to another; the number of valence electrons in the valence shell of a chemical element progressively increases by an unit.
What color does cobalt-oxide produce?
a. blue-violet
b. red
c. yellow
d. green?
There are two types of chemical compound one is covalent compound and other is ionic compound, covalent compound formed by sharing of electron and ionic compound formed by complete transfer of electron. Therefore, the correct option is option A.
What is chemical Compound?Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.
An ionic compound is a metal and nonmetal combined compound. Ionic compound are very hard. They have high melting and boiling point because of strong ion bond. The color of cobalt-oxide is blue-violet. The CoO is a metallic coloring oxide that produces blue in glazes at all temperatures.
Therefore, the correct option is option A.
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What is the ratio of Al 3+ ions to S 2- ions in a neutral compound?
Answer:
The ratio of aluminium to sulfur is 2:3
Explanation:
The ratio of the elements of the neutral compound can be computed from the ionic charges that makes up the compound. The element that makes up the compound is aluminium and sulfur. From the ions aluminium is the cation with a charge of 3+ . The aluminium ion is the cations because it loses 3 electrons from the bonding between it and sulfur. The sulfur is the anion as it gains electrons from the cations.
Aluminium has a charge of 3+ and sulfur has a charge of 2- . The atom of element that makes up the neutral compound can be computed when you cross multiply the charges.
Al3+ and S2-
cross multiply the charges
Al2S3.
The ratio of aluminium to sulfur is 2:3
Select all that apply to physical and chemical properties ?
-Chemical properties can only be observed during a chemical reaction.
-The rustling of iron is a chemical reaction
-Melting and boiling points are physical properties
-Mass and volume are chemical properties
-Various components of a mixture do not combine chemically
Answer:
• Chemical properties can only be observed during a chemical reaction:
Chemical properties can only be established by changing a substance's chemical identity, and chemical properties are different from physical properties, which can be observed by viewing or touching a sample. The internal qualities of a substance must be altered to determine its chemical properties.
Examples:
Some common chemical properties are heat of combustion, enthalpy of formation, toxicity,
and flammability, each of which will be covered in this lesson.
• Rusting of iron is the chemical reaction not physical because:
The rusting of iron is a chemical change because it is two substances reacting together to make a
new substance. When iron rusts, iron molecules react with oxygen molecules to make a compound
called iron oxide. Rusting would only be a physical change if iron molecules remained pure iron
throughout the process.
The equation for this reaction is: 4Fe+ 3O2 → 2Fe2O
• Melting and boiling points are physical properties:
Yes melting and boiling points are the physical properties.
Physical properties can be observed or measured without changing the composition of matter. Physical properties are used to observe and describe matter.
Physical properties include: appearance, texture, color, odor, melting point, boiling point, density, solubility, polarity, and many others.
• Mass and volume are chemical properties:
No mass and volume are the extensive physical properties of matter
All properties of matter are either physical or chemical properties and physical properties are either intensive or extensive.
Extensive properties, such as mass and volume, depend on the amount of matter being measured.
Intensive properties, such as density and color, do not depend on the amount of the substance present.
Physical properties can be measured without changing a substance’s chemical identity.
• Various components of a mixture do not combine chemically:
When various components of a mixture do not combine chemically it is a Combination of substances in which individual components do not combine chemically but retain their individual properties. Mixture in which one or more substances are distributed evenly in another substance.
When various components combine chemically then form chemical compounds that are often divided into two categories. Metals often react with nonmetals to form ionic compounds. These compounds are composed of positive and negative ions formed by adding or subtracting electrons from neutral atoms and molecules
The sentences among the group of answer choices that applies to physical and chemical properties are:
A. Chemical properties can only be observed during a chemical reaction.
B. The rusting of iron is a chemical property.
C. Melting and boiling points are physical properties.
E. The various components of a mixture do not combine chemically.
A physical property can be defined as the properties of a chemical compound (substance) that is measurable and observable without altering the chemical composition of the chemical compound (substance). Some examples of the physical properties of a substance are;
Density.Conductivity.Melting and boiling point.Color.A chemical property can be defined as the properties of a chemical compound (substance) that is observable and measurable during a chemical reaction. Some examples of the chemical properties of a substance are;
Tarnishing. Flammability. Reactivity.Acidity.In conclusion, we can deduce the following from the above definitions of physical and chemical properties;
I. A chemical property can only be observed and measured during a chemical reaction.
II. An example of a chemical property is the rusting of iron.
III. Melting and boiling points are considered to be physical properties.
IV. The various components of a mixture do not combine chemically.
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How are the elements in the periodic table arranged from left to right and top to bottom based on what value?
The elements in the periodic table are arranged from left to right and top to bottom increasing the value of an atomic number.
What is the periodic table?The periodic table can be described as a rows and columns arrangement of the elements. It is used in chemistry, physics, and other sciences, and is seen as an icon of chemistry.
The periodic table can be defined as a graphic formulation of the periodic law, which states that the properties of chemical elements have a periodic dependence on their atomic numbers.
The periodic table is divided into four rectangular areas known as blocks. The rows of the table are known as periods, and the columns are known as groups.
Elements from the same group show similar chemical properties. Trends of the periodic table, with nonmetallic characters increasing from left to right in a period while across a group, and metallic characters increasing in the opposite direction. The reason for these trends in the period and groups is the electron configurations of atoms.
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The forces of attraction that hold oppositely charged ions together in ionic compounds are called _______________.
Why are hydrogen bonds important for the properties of water?
Water binds to each other with a strong attraction called a hydrogen bond. Water is incredibly cohesive as a result. Every day, water drops and streams provide visual proof of water's cohesion.
What is hydrogen bond ?Not a covalent link to a hydrogen atom, hydrogen bonding is a unique kind of dipole-dipole interaction between molecules. It comes about as a result of the attraction between two extremely electronegative atoms, such as N, O, or F, and a hydrogen atom that is covalently bound to one of them.
When a highly electronegative atom's lone pair interacts with the hydrogen atom in an N-H, O-H, or F-H bond, they form a specific type of dipole-dipole interaction known as hydrogen bonding.
When a hydrogen atom that is connected to an electronegative atom moves toward another electronegative atom nearby, powerful intermolecular forces called hydrogen bonds are produced. The hydrogen bond acceptor's electronegativity will rise, resulting in a stronger hydrogen bond.
Thus, Water binds to each other with a strong attraction called a hydrogen attractive force.
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What can you predict about the properties of xenon and helium, both in group 18 in the periodic table? why?
Elements in the same column or group have similar properties in the periodic table. Helium and xenon have similar properties because they are in the same group.
What is an element ?A chemical element is a type of atom with a specific number of protons in its nucleus, including the pure substance made up entirely of that species. Chemical elements, unlike chemical compounds, cannot be broken down into simpler substances by any chemical reaction.
Group 18 elements are gases that are chemically unreactive, meaning they do not form many compounds. As a result, the elements are referred to as inert gases. Noble gas elements, like the other group elements, exhibit trends in their physical and chemical properties.
Group 18 (Nobel Gases) elements are the least reactive. They had already finished their octet. As a result, they prefer not to gain or lose electrons. As a side note, Argon, Krypton, and Xenon are all octet rule exceptions.
Thus, Elements in the same column or group have similar properties in the periodic table.
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Which would be the best to neutralize a large acid spill in your school lab: sodium hydroxide or baking soda? Explain
To neutralize a large acid spill, sodium hydroxide, which is a strong base, would be more efficient than baking soda. However, due to the heat it generates when reacting with acids, precautions must be taken.
Explanation:The question refers to the neutralization of a large acid spill, which requires either sodium hydroxide (NaOH) or baking soda (sodium bicarbonate, NaHCO3). Both substances are bases and can neutralize acids, raising the pH level by providing hydroxide ions (OH-) that combine with the acid's hydrogen ions (H*) to produce water.
However, considering the large scale of the spill in a school lab situation, sodium hydroxide would be a more suitable choice as it is a stronger base and reacts more readily with acids, allowing it to neutralize more acid per gram than baking soda would. Moreover, sodium hydroxide is widely used in various industries to neutralize acidic solutions, reinforcing its effectiveness.
On the other hand, using baking soda also results in the production of carbon dioxide gas, which in a confined lab environment could present additional safety considerations. Notably, the reaction of sodium hydroxide also generates a significant amount of heat, so precautions would need to be taken in its application.
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Sodium hydroxide is the best substance to neutralize a large acid spill in your school lab. It reacts with acids to form water and a harmless salt.
Explanation:The best substance to neutralize a large acid spill in your school lab would be sodium hydroxide rather than baking soda. Sodium hydroxide, also known as lye or caustic soda, is a strong base that can effectively neutralize acids. It reacts with acids to form water and a salt.
When sodium hydroxide reacts with an acid, such as hydrochloric acid (HCl), the following reaction occurs:
NaOH + HCl → H2O + NaCl
This reaction results in the formation of water and sodium chloride (common table salt), which are both harmless substances. Hence, sodium hydroxide is the preferred choice for neutralizing a large acid spill in a school lab.
How many moles of n are in 0.225 g of n2o?
The moles of N atom in 0.225 g of N2O is 10.2 x 10⁻³ moles.
What are moles?Moles is defined as a standard scientific unit for measuring large quantities in measuring small entities such as atoms, molecules and other specified particles. It can also be defined as unit of amount of substance.
Atoms are defined as smallest unit into which matter can be divided without release of electrically charged particles.
The given mass of N2O = 0.225 g
The molar mass o N2O = 44.013 g/mole
So, the number of mole of nitrous oxide in 0.225 g of nitrous oxide
= 0.225 / 44.013 = 5.11 x 10⁻³ moles
The number of nitrogen present in 5.11 x 10⁻³ moles of nitrous oxide
= 5.11 x 10⁻³ x 2 = 10.2 x 10⁻³ moles
Thus, the moles of N atom in 0.225 g of N2O is 10.2 x 10⁻³ moles.
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There are 0.01022 moles or 10.2 x 10⁻³ moles of nitrogen in 0.225 g of N₂O.
To calculate the moles of nitrogen in 0.225 g of N₂O, we determined the molar mass of N₂O, found the moles of N₂O, and then calculated the moles of N based on its molecular composition.
There are 0.01022 moles of nitrogen in 0.225 g of N₂O.To find the number of moles of nitrogen (N) in 0.225 g of N₂O, we need to follow these steps:
Find the molar mass of N₂O.Calculate the moles of N₂O in 0.225 g.Determine the moles of N in N₂O.Step-by-Step Solution
The molar mass of N₂O (N₂O has two nitrogen atoms and one oxygen atom):Therefore, there are 0.01022 moles or 10.2 x 10⁻³ moles of nitrogen in 0.225 g of N₂O.
Silver nitrate and aluminum chloride react with each other by exchanging anions: 3agno3 (aq) + alcl3 (aq) → al(no3)3 (aq) + 3agcl (s) what mass in grams of agcl is produced when 4.22 g of agno3 react with 7.73 g of alcl3?
Answer: 3.6 grams
Explanation:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex]
[tex]\text{Number of moles of silver nitrate}=\frac{4.22g}{170g/mol}=0.025moles[/tex]
[tex]\text{Number of moles of aluminium chloride}=\frac{7.73g}{133g/mol}=0.06moles[/tex]
[tex]3AgNO_3(aq)+AlCl_3(aq)\rightarrow Al(NO)_3)_3(aq)+3AgCl(s)[/tex]
According to stoichiometry:
3 mole of [tex]AgNO_3[/tex] react with 1 mole of [tex]AlCl_3[/tex]
0.025 moles of [tex]AgNO_3[/tex] react with =[tex]\frac{1}{3}\times 0.025=8.3\times 10^{-3}moles[/tex] of [tex]AlCl_3[/tex]
Thus [tex]AgNO_3[/tex] is the limiting reagent as it limits the formation of product and [tex]AlCl_3[/tex] is the excess reagent.
3 moles of [tex]AgNO_3[/tex] produce = 3 moles of [tex]AgCl[/tex]
0.025 moles of [tex]AgNO_3[/tex] produce =[tex]\frac{3}{3}\times 0.025=0.025moles[/tex] of [tex]AgCl[/tex]
Mass of [tex]AgCl[/tex] produced=[tex]moles\times {\text {Molar mass}}=0.025\times 143=3.6g[/tex]
Thus 3.6 g of [tex]AgCl[/tex] is produced.
The mass in grams of AgCl produced when 4.22 g of AgNO₃ react with 7.73 g of AlCl₃ is 3.56 g
From the question, the equation of the reaction is given as
3agno3 (aq) + alcl3 (aq) → al(no3)3 (aq) + 3agcl (s)
This can be written properly as
3AgNO₃ (aq) + AlCl₃ (aq) → Al(NO₃)₃ (aq) + 3AgCl (s)
From the balanced chemical equation above, we observe that
3 moles of AgNO₃ will react with 1 mole of AlCl₃ to yield 1 mole of Al(NO₃)₃ and 3 moles of AgCl.
To determine the mass of AgCl that would be produced when 4.22 g of AgNO₃ react with 7.73 g of AlCl₃,
First, we will convert the given masses to number of moles
Using the formula,
[tex]Number \ of \ moles = \frac{Mass}{Molar \ mass}[/tex]
For AgNO₃
Mass = 4.22 g
Molar mass = 169.87 g/mol
∴ [tex]Number \ of \ moles = \frac{4.22}{169.87}[/tex]
Number of moles of AgNO₃ present = 0.02484 moles
For AlCl₃
Mass = 7.73 g
Molar mass = 133.34 g/mol
∴ [tex]Number \ of \ moles = \frac{7.73}{133.34 }[/tex]
Number of moles of AlCl₃ present = 0.05797 moles
Since,
3 moles of AgNO₃ react with 1 mole of AlCl₃
Then,
0.02484 moles of AgNO₃ will react with [tex]\frac{0.02484}{3}[/tex] moles of AlCl₃ completely.
(NOTE: AgNO₃ is the limiting reagent and AlCl₃ is the excess reagent)
[tex]\frac{0.02484}{3} = 0.00828[/tex]
∴ Only 0.00828 moles of AlCl₃ will react.
Now, since
3 moles of AgNO₃ will react with 1 mole of AlCl₃ to yield 1 mole of Al(NO₃)₃ and 3 moles of 3AgCl
Therefore,
0.02484 moles of AgNO₃ will react with 0.00828 mole of AlCl₃ to yield 0.00828 mole of Al(NO₃)₃ and 0.02484 moles of AgCl
∴ 0.02484 moles of AgCl is produced during the reaction.
Now, we will convert this amount to grams
From the formula
[tex]Mass = Number \ of \ moles \times Molar \ mass[/tex]
Number of moles = 0.02484 moles
Molar mass = 143.32 g/mol
∴ Mass of AgCl produced = 0.02484 × 143.32
Mass of AgCl produced = 3.56 g
Hence, the mass in grams of AgCl produced when 4.22 g of AgNO₃ react with 7.73 g of AlCl₃ is 3.56 g
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The solubility constant of your compound depends on
which statement about elements is false? A. the same kind of atom exist in an element B. there are about 1000 elements found in nature C. some elements have been made in laboratories D. Zinc, Copper,and Iron are elements
How did the rate of the reaction change over time in the control reaction?
Work done after rutherford's gold foil experiment demonstrated that the nucleus contained ________.
Power plants release sulfur dioxide and nitrogen oxides into the atmosphere where they combine with water vapor to form _____.
ozone
acid precipitation
particulates
carbon monoxide
Answer:
The correct option is acid precipitationExplanation:
When sulfur dioxide react with water vapors, they form sulphuric acid. Similarly, when NOx reacts with water vapors to form HNO2 and HNO3. So these acid cause the rain water into acidic rain.The circled areas are called coronal mass ejections solar flares solar wind sunspots . They are cooler than hotter than the same temperature as the surrounding area.
What is a base used in toothpaste sorbitol carrageenan magnesium hydroxide sodium lauryl sulfate
Answer:The correct answer is magnesium hydroxide.
Explanation
Magnesium hydroxide is a base used in toothpaste. The role of base is to neutralize the acid secreted out in our mouth by bacteria present in our mouth which causes tooth decay and other related ailments.
[tex]Mg(OH)_2(aq)+2H^+(aq)\rightarrow 2H_2O(l)+Mg^{2+}(aq)[/tex]
Where as sorbitol is sugar alcohol found in the fruits and plants. Sodium lauryl sulfate is s basic salt which acts as a surfactant used for cleaning purposes.
Carrageenan is a substance extracted from red and purple seaweed used as thickening or emulsifying agents in the food products.
Answer:
Magnesium hydroxide
Explanation:
Toothpaste as such is a mild base. This helps to neutralize the acid produced in the mouth as a result of the action of certain bacteria that help in breaking down food.
Sorbitol is a sugar alcohol and acidic in nature
Carrageenan is a linear polysaccharide and also acidic
Sodium lauryl sulfate is a surfactant and mildly acidic
However, magnesium hydroxide (Mg(OH)2) is a base which is used in toothpastes.
The speed of light has been measured to be about ____ miles a second.
186,000
1,000,000
1,100
10,000
Which metallic element may be considered as the periodic table's "cruel joke", and why?
Does c3h6clf conduct electricity when dissolved in water
The magnitude of torque is the product of which two variables
Torque is physical quantity defined in terms of force and distance. It is the product of force and the perpendicular distance. Thus the two variables are force and perpendicular distance.
What is torque?Torque can be defined as the rotational analogue of linear force. It can also called as rotational force or turning effect. The force that can make an object to rotate along an axis is measured in torque.
Similar to how force accelerates an item in linear kinematics, torque accelerates an object in an angular direction.Torque is a vector quantity. The force acting on the axis determines the direction of the torque vector.
The definition of torque is the product of the force's strength and the angle at which the force's line of action is perpendicular to the axis of rotation.
The lowercase Greek letter tau is commonly used as the torque symbol . Moment of force is frequently represented by the letter M.
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What occurs when the temperature of 10.0 grams of water is changed from 15.5 degrees celsius to 14.5?
Final answer:
When the temperature of 10.0 grams of water decreases from 15.5°C to 14.5°C, it loses 41.84 Joules of heat, calculated using the specific heat capacity of water.
Explanation:
When the temperature of 10.0 grams of water is changed from 15.5 degrees Celsius to 14.5 degrees Celsius, the process involves a decrease in the water's thermal energy. To compute the amount of heat lost, the specific heat capacity of water is applied, which is 4.184 J/(g °C). The equation used is Q = mcΔT, where Q is the heat transferred, m is the mass of the water, c is the specific heat capacity, and ΔT is the change in temperature.
By plugging the values into the equation: Q = (10.0 g)(4.184 J/(g °C))(14.5°C - 15.5°C) = -41.84 J. This result indicates that the water loses 41.84 Joules of heat as its temperature decreases by 1 degree Celsius.
The wavelength of some yellow light is 580.0 nm. What is the frequency of this yellow light?
The frequency of yellow light of wavelength 580 nm is [tex]\boxed{{0.05172\times10^{18}}\text{Hz}}[/tex]
Further Explanation:
Wavelength is the characteristic property of a wave. The term wavelength is defined as the distance between two successive crests or troughs in a wave. It is represented by [tex]\lambda[/tex] and its SI unit is meter (m).
The term frequency is defined as the number of times n event occurs in unit time. It is generally applied to waves including light, sound and radio waves. It is denoted by [tex]{\text{v }}[/tex] and its SI unit is Hertz (Hz).
The conversion factor to convert nm to m is,
[tex]1\;{\text{nm}}={10^{ - 9}}\;{\text{m}}[/tex]
The wavelength and frequency of light are related to each other by the following expression,
[tex]{\text{c}} = {v\lambda}[/tex] ......(1)
Here,
C is the speed of light.
[tex]v[/tex] is the frequency of light.
[tex]\lambda[/tex] is the wavelength of light.
Rearrange equation (1) to calculate the frequency of light.
[tex]v=\dfrac{c}{\lambda}[/tex] ......(2)
The wavelength of yellow light is 580 nm.
Firstly, wavelength of yellow light is to be converted from nm to m as follows:
[tex]\begin{aligned}{\text{Wavelength of yellow light }}\left({\text{m}}\right)&=\left( {{\text{580 nm}}}\right)\left({\frac{{{{10}^{ - 9}}\;{\text{m}}}}{{1\;{\text{nm}}}}}\right)\\&=58\times {10^{ - 10}}\;{\text{m}}\\\end{aligned}[/tex]
The speed of yellow light is [tex]3 \times {10^8}\;{\text{m/s}}[/tex].
The wavelength of yellow light is [tex]58\times {10^{ - 10}}\;{\text{m}}[/tex].
Substitute these values in equation (2)
[tex]\begin{aligned}{v }}&=\frac{{{\text{3}}\times{\text{1}}{{\text{0}}^8}\;{\text{m/s}}}}{{58 \times{{10}^{ - 10}}\;{\text{m}}}}\\&=0.05172\times{\text{1}}{{\text{0}}^{18}}\;{\text{Hz}}\\\end{aligned}[/tex]
So the frequency of yellow light is [tex]{\mathbf{0}}{\mathbf{.05172 \times 1}}{{\mathbf{0}}^{{\mathbf{18}}}}\;{\mathbf{Hz}}[/tex].
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Answer details:
Grade: Senior School
Subject: Chemistry
Chapter: Structure of the atom
Keywords: frequency, wavelength, yellow light, 580 nm, crests, troughs, speed of light, wavelength of light, frequency of light, conversion factor, Hz, m.
The frequency of this yellow light with wavelength, 580.0 nm is; 5.2 × 10¹⁴ Hz.
According to the question:
The wavelength of the yellow light is 580.0 nm.By convention, the speed of light (photons), c = 3×10⁸ m/s.We must also establish the relationship between the speed, wavelength and frequency as follows;
c = f × λ
Therefore, f = c/λ
where,
c = speed of lightf = frequencyλ = wavelength.However, 580nm = 580 × 10^-⁹ m = 5.8 × 10-⁷m
Since, 1nm = 10^-9mConsequently, the frequency, f of this yellow light is;
f = 3×10⁸/5.8 × 10^-⁷f = 5.2 × 10¹⁴ Hz.Read more:
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How many molecules of rubp are oxygenated for each molecule of co2 that is released by photorespiration?