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Earthquake produces which kind of sound ...

Earthquake produces which kind of sound before the main shock wave begins :

A

ultrasound

B

infrasound

C

audible sound

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
B
Earthquake produces low frequency (i.e., 5 Hz) infrasound before the main shock waves begin which possibly alert the animals and they get disturbed.
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Three different vibrating objects produce three types of sounds X,Y and Z. sounds X and Y cannot be heard by a man having normal range of hearing but sound Z. can be heared easily. The sound X is used in hosphitals to break kidneys stones of a patient into fine grains which then get flushed out with urine. The sound Y is similar to that which is produced during an earthquake before the main shock wave is generated. (a) What type of sounds are (i) X (ii) Y, and (iii) Z? (b) Name one device which can produce sound like X. (c) Name one device in a science laboratory which can produce sound like Y. (d) Name one device in our homes which can produce sound like Z. (e) What is the frequency range of sounds like Z?

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An earthquake generates both transverse (S) and longitudinal (P) sound waves in the earth. The speed of S waves is about 4.5 km /s and that of P waves is about 8.0 km/s . A seismograph records P and S waves from an earthquake. The first P wave arrives 4.0 min before the first S wave. The epicenter of the earthquake is located at a distance about

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NCERT EXEMPLAR-SOUND-Sound
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