PDF chapter test TRY NOW
1. Does any part of our body vibrate when we speak? Name the part.
, when we speak the part which vibrates is called .
2. Boojho saw a cracker burst at night at a distance from his house. He heard the sound of the cracker a little later after seeing the cracker burst. Give the reason for the delay in hearing the sound.
The light travels than sound. So, the light from the cracker reaches than that of sound of the cracker.
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