Q.

A bomb explodes on the moon. You will hear its sound on earth after –

A. 20 minutes
B. 2 hours 20 minutes
C. 3.7 hours
D. You cannot hear the sound of explosion
Answer» D. You cannot hear the sound of explosion
Explanation: The sound will never reach Earth because there are not enough molecules or atoms of matter per cubic centimeter of space to create the pressure waves in a medium that is a sound wave. In simple words, Sound propagation needs a medium. The people on the Earth can see the flash, but no sound.
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