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Assertion: When a light wave travels fro...

Assertion: When a light wave travels from a rarer to a denser medium, it loses speed. The reduction in speed imply a reduction in energy carried by the light wave.
Reason: The energy of a wave is proportional to velocity of wave.

A

(a) If both assertion and reason are true and reason is the correct explanation of assertion.

B

(b) If both assertion and reason are true but reason is not the correct explanation of assertion.

C

(c) If assertion is true but reason is false.

D

(d) If assertion and reason both are false.

Text Solution

Verified by Experts

The correct Answer is:
D
When a light wave travel from a rarer to a denser medium it loses speed, but energy carried by the wave does not depend on its speed. Instead, it depends on the amplitude of wave.
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When light travels from a rarer to denser medium, it loses some speed. Does the reduction in speed imply a reduction in the energy carried by the light wave ?

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Knowledge Check

  • When light travels from a rarer medium to a denser medium, it ________

    A
    speed remains the same
    B
    speeds down then up
    C
    speeds down
    D
    speeds up

  • A light wave can travel

    A
    in vacuum
    B
    in vacuum only
    C
    in a meterial medium
    D
    in a meterial medium only.

  • Assertion (A): When a light wave travels from rarer to denser medium, its speed decreases. Due to this reduction of speed the energy carried by the light wave reduces. Reason (R): Energy of wave is proportional to the frequency.

    A
    Both A and R are true and R is the correct explanation of A
    B
    Both A and R are true but R is NOT the correct explanation of A
    C
    A is true but R is false
    D
    A is false and R is true

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    Explore conceptually related problems

    (a) When monochromatic light is incident on a surface separating two media, the reflected and refracted ligth both have the same frequency as the incident frequency. Explain why ? (b) When light travels from a rarer to a denser medium, it loses speed. Does the reduction in speed imply a reduction in energy carried by the light wave ? ( c) In the wave picture of light, intensity of ligth is determined by the square of amplitude of wave. What determines the intensity of light in teh photon picture of light ? (NCERT Solved Example)

    When light travels from a rarer to a denser medium, the speed decreases. Does this decrease in speed imply a decrease in the energy carried by the light wave ? Justify your answer.

    (a) When monochromatic light is incident on a surface separating two media, the reflected and refracted light both have the same frequency as the incident frequency. Explain why ? (bb) When light travels from a rarer to a denser medium, the speed decreases. Does the reduction in speed imply a reduction in the energy carried by the light wave? c) In the wave picture of light, intensity of light is determined by the square of the amplitude of the wave. What determines the intensity of light in the photon picture of light.

    When a wave travels from a denser to rarer medium, then

    A: When light travels from a rarer to a denser medium, it loses some speed but it doesn't imply a reduction in the energy carried by the light wave. R: Energy carried by a wave depends on the amplitude of the wave and not on the speed of wave propagation.

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