Question

Q1. A. When lightning strikes the sound is heard a little after the flash is seen
R: The velocity of light is greater than that of the sound.
Q2. A: Two people on the surface of the moon cannot talk to each ather.
R: There is no atmosphere on moon.
Q3. A: Every vibrating body is a source of sound.
R: All sounds are audible to us.
Q4 A: The sound which cannot be heard pleasantly is called noise.
R: The sound above 80 dB becomes painful. assertion and reason
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Answer 1

Answer:

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