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Q.

Which kind of sound waves does an earthquake produce before the main shock?

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a

Natural sound waves 

b

None of the above 

c

Ultrasonic sound waves 

d

Infrasonic sound waves 

answer is B.

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Detailed Solution

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Infrasonic sound waves are sound waves with a frequency of less than 20 Hz. these Infrasonic sound waves produced by Earthquake before the main shock wave.

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