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Assertion (A): When lightning strikes, the sound is heard a little after the flash is seen.
Reason (R): The velocity of light is greater than that of sound.

  1. A
    Both A and R are true and R is the correct explanation of A.
  2. B
    Both A and R are true but R is not the correct explanation of A.
  3. C
    A is true but R is false.
  4. D
    A is false but R is true.

Solution & Step-by-step Explanation

Both statements are true. The speed of light in air is exceptionally fast (), while the speed of sound in air is much slower (approx. ). Because light travels significantly faster, the visual flash reaches our eyes almost instantly, while the sound wave (thunder) takes a noticeable amount of time to arrive. Thus, R perfectly explains A.

Practice this question

Try it yourself before checking the explanation above.

Assertion (A): When lightning strikes, the sound is heard a little after the flash is seen.
Reason (R): The velocity of light is greater than that of sound.
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 but R is true.

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Wave MotionAcousticsSpeed of Light and Sound

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