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Q.

Sound cannot propagate in _________________________.


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a

Vacuum

b

Solid

c

Liquid

d

Gases 

answer is A.

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Detailed Solution

Concept: Here, we need to tell what medium sound cannot propagate.
Sound is a form of energy which travels in the form of waves. To travel it needs medium. This medium helps sound waves to reflect and vibrate.
Without reflection and vibration, the sound waves cannot move forward. So, the presence of a medium is must for sound to propagate.
As we know there are three mediums solid, liquid and gases. And, vacuum is not a medium, it has presence of no particles in it.
Hence, sound cannot propagate in vacuum.
Hence, option 1 is correct.
 
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