Question

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Answer 1

Answer:

1. sound is produced by a vibrating body.

2. a sound of frequency less than 20 Hz is called infrasonic sound.

3. when we increase the loudness of the sound produced by a radio the property of the sound wave that changes its amplitude.

4.sound is a longitudnal wave.

5. when body moves with a speed which is greater than the speed of sound in air , it is said to be travelling at supersonic speed.

6.the distance between two sonsequtive crests or troughs is known as sound wave.

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