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The sounds of frequency less than 20 Hz ...

The sounds of frequency less than 20 Hz are known as

A

Ultra sounds

B

Soft sounds

C

Louder sounds

D

Infrasonics

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Knowledge Check

  • One end of 85 cm long pipe is made closed. Now, normal modes of vibration are set up in the air column, inside this pipe. Find no. of harmonics having frequency less than 1250 Hz. (Velocity of sound in air is 340 m/s.)

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