A ray in glass arrives at the glass-water interface at an angle of 48° with the normal. The refracted ray, in water, makes a 72° angle with the normal. The index of refraction of water is 1.33. Then the ray in glass is redirected so its new angle of incidence is 37°. What is the new angle of refraction in the water? Show all work. (2 points)



An electromagnetic wave of frequency 2.30 × 10^14 Hz propagates in carbon tetrachloride with a speed of 2.05 x 10^8 m/s. What is the wavelength of the wave in carbon tetrachloride? Show all work and include units of measure. (2 points)


Based on the data in the graph provided, which value is closest to the index of refraction of quartz for extreme violet light of wavelength 400 nm? (1 point)

1.44
1.53
1.56
1.67


The index of refraction of medium 1 is 2.3 and the index of refraction for medium 2 is 1.6. What is the critical angle for light traveling within medium 1 toward medium 2? (1 point)
40°
14°
44°
70°


A ray of laser light strikes a glass surface at an angle θa = 22.5° to the normal. What is the angle θb of the refracted ray? Let the index of refraction for glass nb = 1.77. (1 point)
12.7°
12.5°
31.8°
10.1°


As explained by the theory of quantum electrodynamics, light is best described as _____. (1 point)
Both a wave and particles.
A wave, not particles.
Particles, not a wave.


Match the following types of electromagnetic waves with where they exist on the electromagnetic spectrum. (2 points)


1


2


3


4


a. Radio Waves
b. Infrared
c. Gamma Rays
d. X-Rays


Describe the difference(s) between electromagnetic waves and mechanical waves. Provide an example of each in your descriptions. (2 points)


A step-down transformer providing electricity for a residential neighborhood has exactly 2750 turns in its primary. When the potential difference across the primary is 5670 V, the potential difference at the secondary is 240 V. How many turns are in the secondary? Show all work. (2 points)


A circuit has 3 resistors, all connected in parallel. Let R1 = 4.0 Ω, R2 = 3.0 Ω, and R3 = 6.0 Ω. What is the equivalent resistance of the circuit? Show all work and include units of measure.

Answer:

Thus, astronomers can identify what kinds of stuff are in stars from the lines they find in the star's spectrum. This type of study is called spectroscopy. ... From spectral lines astronomers can determine not only the element, but the temperature and density of that element in the star.

Explanation:

Scientists use spectroscopy to identify the elements present in stars by analyzing the light they emit. The distinct atomic spectra for each element acts as a fingerprint, allowing astronomers to understand a star's composition and its evolution over time.

Scientists determine the elements present in different stars by using spectroscopy to analyze the light those stars emit. Each chemical element has a unique atomic spectrum, either emitting or absorbing specific wavelengths of light, identifiable through spectroscopic techniques. By comparing the observed spectra with known spectra obtained in laboratories, astronomers can deduce the elements that make up a star. Stars primarily consist of hydrogen and helium, but the presence of heavy elements, such as iron, varies, offering insight into their composition and history.

The study of light elements like lithium, beryllium, and boron in stars, as compared to heavier ones, can illuminate the processes of stellar evolution and the creation of new stellar and planetary bodies. Information from stars' spectra, including subtle shifts due to Doppler effect adjustments for radial velocity, allows scientists to understand not only a star's chemical makeup but also its motion in space. Thus, spectroscopy is a powerful tool for uncovering the secrets of celestial bodies, from individual stars to distant galaxies.

Answer: it is period 93

Explanation:

The period of a wave, measured in seconds, is the reciprocal of its frequency. Given that a piano note vibrates at a frequency of 262 times per second, the period of the wave is approximately 1/262 or 0.00381 seconds.

In physics, the frequency is the number of waves that pass a fixed point in a given time period. We typically measure it in hertz (Hz), which is synonymous with cycles per second. On the other hand, the period is the duration it takes for one cycle to pass, which is the reciprocal of the frequency.

Here the note on the piano is stated to vibrate (frequency) 262 times per second. Thus, to calculate the period, we take the reciprocal of the frequency i.e. 1 divided by the frequency. Hence, it's 1/262 which equals approximately 0.00381 seconds. So, the period is about 0.00381 seconds.

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Answer:

hypermetropia

Explanation:

long-sightedness.

Answer:

Habitat deconstruction due to pollution

Explanation:

Hope this helps mate! :)

Answer:

the law of conservation of energy states that the total energy of an isolated system remains constant; it is said to be conserved over time

Explanation:

Answer:

514.5 meters

1687.9921 feet

Explanation:

speed of sound = 343 m/s

1.5 (seconds) x 343 (m/s) = 514.5 meters

The distance of the lightning strike is approximately 514.5 meters or 0.5145 kilometers away, calculated by multiplying the time delay of the thunder clap (1.5 seconds) with the average speed of sound (343 m/s).

If a thunder clap comes 1.5 seconds after a lightning strike, you can estimate the distance of the strike from your location. Since the speed of sound varies with temperature, we'll use the average speed of sound at room temperature, which is approximately 343 meters per second. To calculate the distance, you multiply the time it takes to hear the thunder (1.5 seconds) by the speed of sound (343 m/s), which equals to about 514.5 meters or roughly 0.5145 kilometers away.

Answer:

Purple

Explanation:

They've all gone for the same amount of time, but purple is pointed the highest

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Hi,  

All of it is true. :

Uranus is a pale green planet, with 27 satellites and several rings.

Answer:

299,792 kilometers per second.

Explanation:

Hope I helped ya.

< Sarah >

Answer: 300 million meters per second

Explanation:

Srry if I'm wrong

When viewed from a point on the positive z-axis (looking downward), the subsequent motion of the electron in a region with a uniform magnetic field in the positive z-direction will be in a circular path around the z-axis. This path is perpendicular to both the electron's velocity vector and the magnetic field direction.

The motion of charged particles like electrons in a magnetic field is governed by the Lorentz force equation:

F = q * (v x B)

where:

F is the magnetic force acting on the electron,

q is the charge of the electron,

v is the velocity of the electron,

B is the magnetic field vector.

Since the velocity of the electron (v) is in the positive x-direction, and the magnetic field (B) is in the positive z-direction, the cross product (v x B) will result in a force perpendicular to both the x and z axes. This force causes the electron to move in a circular path around the z-axis.

This motion is commonly referred to as circular motion in a magnetic field, and it is similar to the way charged particles move in a cyclotron or a particle accelerator. The electron will continue to move in this circular path as long as it remains in the region with the uniform magnetic field and no other forces act on it.

Hence, When viewed from a point on the positive z-axis (looking downward), the subsequent motion of the electron in a region with a uniform magnetic field in the positive z-direction will be in a circular path around the z-axis. This path is perpendicular to both the electron's velocity vector and the magnetic field direction.

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Answer:

Inertia

Explanation:

Inertia is the inherent property of an object to remain in its state of rest or motion without being disturbed.

Answer:

inertia

Explanation:

Answer:diffraction

Explanation:

Answer:

2.4m/s^2

Explanation:

To find the acceleration you divide velocity by the time.

Answer:

1/ How do scientists determine the elements present in different stars?

KEY WORD for the main idea: Analysis of the starlight.

Answer: Scientists can identify what elements present in different stars by analysing the starlight.

Note: The "starlight" = spectral lines. Astronomers can can identify what kinds of stuff are in stars from the lines they find in star's spectrum. From spectral lines astronomers can determine not only the element, but the temperature and density of that element in the star.

..

2/ What happens to a star when the fuel for its nuclear fusion reactions is exhausted?

KEY WORD for the main idea: generate light from energy

Answer: A star generates energy through nuclear fusion; this energy is released a light and heat.

Note: The energy source for all stars is nuclear fusion. Stars spend most of their lives repetitively compressing two hydrogen atoms into a single helium atom - plus a lot of energy, which is released as light and heat. A normal star that has exhausted the nuclear fuel in its interior, its outer layers have expanded, and it has become a red giant.

....

3/ Why aren't stars and galaxies spread out evenly across the universe?

KEY WORD for the main idea: Gravitational attraction

Answer: Stars and Galaxies aren't evenly distributed uniformly throughout the universe, because of the existance of gravity.

Note: Gravity, as one of the fundamental forces of the universe, is the powerful force that glues our universe together. This is the one that causes every object in the universe to attract every other object. One of the most noticeable effects of gravity in the solar system is the orbit of the planets.

Explanation:

Hope this answer can help you. Have a nice day !

Answer:

In summary the blanket that is metallic reflects electromagnetic waves

Explanation:

The teacher running the marathon generates a quantity of heat that the body must release to keep its temperature constant, one of the ways to release this energy in the form of electromagnetic radiation in the infrared range.

The matte with is silver should be metallic, so it reflects light at all wavelengths, so that the infrared light returns to the body and decreases the radiation radiation emitted, thus keeping it warmer.

In summary the blanket that is metallic reflects electromagnetic waves

Answer:

Electric field, [tex]E=9.97\times 10^5\ N/C[/tex]

Explanation:

We have,

Charge on electron is [tex]1.602\times 10^{-19}\ C[/tex]

Distance between electron is 38 nm.

It is required to find the electric field inside the picture tube. The electric field at a distance r is given by :

[tex]E=\dfrac{kq}{r^2}\\\\E=\dfrac{9\times 10^9\times 1.6\times 10^{-19}}{(38\times 10^{-9})^2}\\\\E=9.97\times 10^5\ N/C[/tex]

So, the electric field inside the picture is [tex]9.97\times 10^5\ N/C[/tex]

Answer:

997,000

Explanation:

just did the assignment for electric fields, grade 10. have a nice day :)

Answer:

[tex]\dot{W_{H} } = 4244.48 Btu/h[/tex]

Explanation:

Temperature of the house, [tex]T_{H} = 70^{0} F[/tex]

Convert to rankine, [tex]T_{H} = 70^{0}+ 460 = 530 R[/tex]

Heat is extracted at 40°F i.e [tex]T_{L} = 40^{0}F = 40 + 460 = 500 R[/tex]

Calculate the coefficient of performance of the heat pump, COP

[tex]COP = \frac{T_{H} }{T_{H} - T_{L} } \\COP = \frac{530 }{530 - 500 }\\ COP = \frac{530}{30} \\COP = 17.67[/tex]

The minimum power required to run the heat pump is given by the formula:

[tex]\dot{W_{H} } = \frac{\dot{Q_{H} }}{COP} \\[/tex]...............(*)

Where the heat losses from the house, [tex]\dot{Q_{H} } = 75,000 Btu/h[/tex]

Substituting these values into * above

[tex]\dot{W_{H} } = \frac{75000}{17.67} \\ \dot{W_{H} } = 4244.48 Btu/h[/tex]

Answer:

C

Explanation:

Big Brain ;3

Final answer:

Black pavement becoming hot in the sunlight is an example of light waves being absorbed, as the pavement captures the light's energy, converting it into heat.

Explanation:

When light travels from one medium to another, some of the light is transmitted, some is reflected, and some is absorbed. An example of light waves being absorbed is when a road's black pavement becomes hot in the sunlight. This absorption happens because the pavement captures the energy of the light waves, converting it to heat, which makes the pavement hot. This process is why black-coloured surfaces heat up more in the sunlight than lighter-coloured surfaces, due to their higher absorption capacity.

When 20 J of work is done in 4 seconds, the power is 5 watts

Power is the rate at which work is done, expressed in watts.

In this case, if 20 J of work is done in 4 seconds, the power can be calculated as follows:

Power = Work done / Time taken

Power = 20 J / 4 s

= 5 watts

Answer:

A

Explanation:

because if the tides come in faster that means that more energy could be harnessed.

Answer:

Due to gravity on the earth but on moon there is 1/6th of the gravity than on earth. Since the acceleration of gravity Is lesser in moon and weight is constant, the weight of an object is lesser on the surface of the moon.

Explanation:

Answer: C.

The gravitational pull of Earth is greater than that of the Moon.

Explanation: plato

Answer:

Genetic Engineering: the direct manipulation of an organisms genes using biotechnology (ex. genetically engineering corn to be insect resistant)

Cloning: The process of producing genetically identical individuals of an organism either natually or artificially,cloning allows for the creation of multiple copies of genes, expression of genes, and study of specific genes (ex. Cloning cells for untreatable diseases)

Artificial Selection: Also known as Selective breeding it is the process by which humans use animal breeding and plant breeding to selectively develop particular phenotypic traits/ characteristics (ex. Dog breeding)

Answer:

Genetic Engineering :

Benefits

-Ability to create food that is resistant to pests, cold, and disease

-Greater food production volume and increased vitamins

Risks

-Concerns about long-term health risks

-Lack of regulation

Cloning

Benefits

-Ability to increase endangered animal populations

-Possibility of eliminating diseases and defective genes

Risks

-Shorter lifespan for cloned animals

-Greater chance of health issues for cloned animals

Artificial Selection

Benefits

-Allows for selection of desired traits

-Ability to create better versions of organisms

Risks

-Loss of genetic diversity

-Increased chance of diseases that can shorten lifespan

Explanation:

This is straight from the lesson 6.01 page 5 (FLVS)

Answer:

while using brainly app. there is an option of uploading image of diagram, graph or plot. plz use that feature to upload image of the standing wave so that your question can be properly answeres

Convex Mirrors are the mirrors that are used for  security purposes.

Convex Mirrors are the type of mirrors that are used in road safety, security and observation applications. For example, convex security mirrors act as effective deterrents when used in shops and convex safety mirrors help to avoid collisions.

So we can conclude that Convex Mirrors are the mirrors that are used for  security purposes.

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The Convex mirror is the mirror that is generally used for security purposes (Option A and B).

The term mirror refers to any reflecting surface. There are different kinds of curved mirrors such as;

The Convex mirror is used for security purposes because they help to magnify the image and broaden the scope of view allowing the store attendants to see better.

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Answer:

Magnitude (in kilogram) of the resultant force, [tex]|M| = 1958.53 kg[/tex]

Direction = 164.37°

Explanation:

The two forces exerted by the two tugboats are non zero vectors, therefore they can be expressed as:

For the 1620 kg tugboat in the direction N35degrees​W

[tex]M_{1} = 1620 cos \theta_1 i + 1620 sin \theta_1 j\\[/tex]

The direction of the force from the positive x - axis, [tex]\theta_1 = 90 - 35 = 55^{0}[/tex]

The equation above then becomes:

[tex]M_{1} = 1620 cos 55 i + 1620 sin 55 j\\ M_{1} = (1620 * 0.57) i + (1620*0.82) j\\M_{1} = 923.4 i + 1328.4j[/tex]

For the 1250 kg tugboat in the direction S50degrees​W

[tex]M_{2} = 1250 cos \theta_2 i + 1250 sin \theta_2 j\\[/tex]

The direction of the force from the positive x - axis,

[tex]\theta_2 = - (90 - 50) = - 40^{0}[/tex]

The equation above then becomes:

[tex]M_{2} = 1250 cos(-40) i + 1250 sin (-40) j\\ M_{2} = (1250 * 0.77) i - (1250*0.64) j\\M_{2} = 962.5 i - 800j[/tex]

The resultant vector will be given by:

[tex]M = M_{1} + M_{2} \\ M = 923.4 i + 1328.4j + 962.5 i - 800j\\M = 1885.9i + 528.4j[/tex]

The magnitude of the resultant is given by:

[tex]|M| = \sqrt{1885.9 ^{2} + 528.4^2 } \\|M| = \sqrt{3556618.81 + 279206.56}\\|M| = \sqrt{3835825.37} \\|M| = 1958.53 kg[/tex]

The direction will be given by :

[tex]cos \theta = \frac{a}{|M|} \\cos \theta = \frac{1885.9}{1958.53}\\cos \theta = 0.963\\\theta = cos^{-1} 0.963\\\theta = 15.63^0[/tex]

Direction = 180 - 15.63 = 164.37°

Astronauts must have their own supply of oxygen in their spacesuits during spacewalks due to the absence of breathable air in the vacuum of space, and to protect them from harmful solar radiation and the extreme temperatures of space. The suits also maintain positive pressure relative to the outside to prevent air from the vacuum of space from entering the suit if a leak occurs.

Astronauts must have their own supply of oxygen within their spacesuits during spacewalks because outer space does not have an atmosphere like the Earth which contains beneficial and breathable air; instead, space is a vacuum. This absence of atmosphere leaves astronauts exposed to the direct speed and force of solar radiation which can be harmful and potentially lethal. Their spacesuits, equipped with their own oxygen supply, not only enable astronauts to breathe but also serve as a barrier to protect them from this radiation and the extreme temperatures of space. The suit also maintains a positive pressure relative to the outside, ensuring that if a leak occurs, air will flow out of the suit, not into it from the vacuum of space.

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Answer:

Magnetic domains

Explanation:

The areas in which the individual magnetic orientations of atoms line up are called magnetic domains.

In most magnetic materials, atoms are arranged in such a way that the magnetic orientation of one electron cancels out the orientation of another

In magnetic domain electrons have the same magnetic orientation. This means that the individual magnetic moments of the atoms are aligned with one another and they point in the same direction.

Answer:

because of its energy store it had potential and gravity energy stores befoare you let it go and when it swings it lets off its gravitational enery and the potential energy goes to

Explanation: