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  4. A bomb explodes on the moon. How long will it take for the sound to reach the earth?

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Q. A bomb explodes on the moon. How long will it take for the sound to reach the earth?

Punjab PMETPunjab PMET 2006Electromagnetic Waves

Solution:

The radius of moon and acceleration due to gravity at its surface both are smaller compared to earth. Therefore the escape velocity at moon is $2.38 \,kms^{-1}$ At the temperature of moon, the average velocity of gas molecules greater than this.
Therefore, gas molecules cannot stay at moon. Hence, there is no atmosphere around the moon. Since sound waves need a medium for propagation therefore, sound produced by the bomb explosion will never reach the earth.