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Over [174]
3 years ago
15

Which statement correctly compares the speed of light

Physics
2 answers:
11111nata11111 [884]3 years ago
6 0

<u>Answer:</u> The correct answer is Option D.

<u>Explanation:</u>

Refractive index is defined as the ratio of speed of light in vacuum to the speed of light in medium. It is represented as \eta. Speed of light in vacuum is always equal to 3\times 10^8m/s

Mathematically,

\eta=\frac{\text{Speed of light in vacuum}}{\text{Speed of light in medium}}

If the refractive index is more, the speed of light in that medium will be slow and vice-versa.

As, the refractive index of glass is more than the refractive index of space. Hence, the speed of light will be slower in glass.

Therefore, the correct answer is Option D.

Elodia [21]3 years ago
4 0

The speed of light in glass is slower than the speed of light through space.


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a stone is thrown by a person from the top of the building, which is 200m tall. at the same time, another stone is thrown with v
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Answer:

The time after which the two stones meet is tₓ = 4 s

Explanation:

Given data,

The height of the building, h = 200 m

The velocity of the stone thrown from foot of the building, U = 50 m/s

Using the II equation of motion

                             S = ut + ½ gt²

Let tₓ be the time where the two stones  meet and x be the distance covered from the top of the building

The equation for the stone dropped from top of the building becomes

                            x = 0 + ½ gtₓ²

The equation for the stone thrown from the base becomes

                S - x = U tₓ - ½ gtₓ²  (∵ the motion of the stone is in opposite direction)

Adding these two equations,

                      x + (S - x) = U tₓ

                               S = U tₓ

                               200 = 50 tₓ

∴                                  tₓ = 4 s

Hence, the time after which the two stones meet is tₓ = 4 s   

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Answer:

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Explanation:

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