Q13 of 54 Page 389

Infrasonic vibrations and ultrasonic vibrations.

Infrasonic vibrations: Their frequency is below 20 Hz.


Ultrasonic vibrations: Their frequency is above 20 KHz.


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11

Transverse waves and longitudinal waves.

 12

Crest and trough.

 14

Compression and rarefaction.

 15

Loudness and intensity of sound.