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

2 hours 20 minutes
3.7 hours
You cannot hear the sound of explosion
20 minutes

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Physics
Stationary wave is formed by

Two waves of same frequency travelling in the same direction
A transverse wave superposing a longitudinal wave
Two waves of same frequency travelling in the opposite direction
Two waves of the same speed superposing

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