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3 years ago

Which accurately describes the behavior of sound and light in the vacuum of space?

2 answers:

8 0

<span>
A vacuum doesn't contain a medium. Light, which is an electromagnetic
wave and doesn't require a medium, will travel there. Sound, which is a
mechanical wave and requires a medium, will not travel there.</span>

(You can see the light of the sun and other stars, which travels to us through
space. Astronauts can't hear the sound of each others' voices when they're
standing together on the moon because there's no medium between them,
so they have to use radio even to go only a few feet.)

MrRissso [65]3 years ago

4 0

Answer: A Medium is not necessary

Is C

Explanation: In contrast, light waves <em>CAN </em>travel through a vacuum, and do not require a medium. In empty space, the wave does not dissipate grow smaller no matter how far it travels, because the wave is not interacting with anything else. However, light can also travel within some materials, like glass and water.

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We say that visible light has wavelength from 400nm to roughly 800nm. What is the biggest "energy-jump" (excited) for an atom if

icang [17]

Answer:

$4.98\cdot 10^{-19} J$

Explanation:

The energy of the emitted photon is inversely proportional to its wavelength, according to the equation:

$E=\frac{hc}{\lambda}$

where

$h=6.63\cdot 10^{-34} Js$ is the Planck's constant

$c=3.0\cdot 10^8 m/s$ is the speed of light

$\lambda$ is the wavelength

This means that the biggest energy is released when the wavelength is the shortest. For a photon of visible light, the shortest wavelength is

$\lambda=400 nm = 400\cdot 10^{-9} m$

So, substituting into the equation, we find the corresponding energy:

$E=\frac{(6.63\cdot 10^{-34})(3\cdot 10^8)}{400\cdot 10^{-9}}=4.98\cdot 10^{-19} J$

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4 years ago

The graph shows the motion of a car. Which segment

Anastasy [175]

The answer is d because that’s the lowest velocity and it’s a straight line showing it’s not going faster

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3 years ago

A crate is dragged up a ramp at constant speed. The work done on the system can be accounted for by:

Alex

Answer:

The work done on the system can be accounted for by;

Both $E_g$ and $E_{int}$

Explanation:

The speed of the crate = Constant

Therefore, the acceleration of the crate = 0 m/s²

The net force applied to the crate, $F_{NET}$ = 0

Therefore, the force of with which the crate is pulled = The force resisting the upward motion of the crate

However, we have;

The force resisting the upward motion of the crate = The weight of the crate + The frictional resistance of the ramp due to the surface contact between the ramp and the crate

The work done on the system = The energy to balance the resisting force = The weight of the crate × The height the crate is raised + The heat generated as internal energy to the system

The weight of the crate × The height the crate is raised = Gravitational Potential Energy = $E_g$

The heat generated as internal energy to the system = $E_{int}$

Therefore;

The work done on the system = $E_g$ + $E_{int}$ .

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3 years ago

What types of areas are more prone to floods?

geniusboy [140]

Areas with poor drainage system

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3 years ago

What is polarization. How can we remove it?

weqwewe [10]

Polarization is the action of restricting the vibrations of a transverse wave, especially light, wholly or partially to one direction .

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3 years ago