Question

Statements given below are incorrect. Write the correct statements :--

1. Air is an opaque body .

2. The sound of frequencies less than about 20Hz is called Sonic sound ​

Answer 1

Answer:

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Explanation:

1. False , air is transparent

2. false , Ultrasonic sound: Infrasonic sound (i) Sound of frequency higher than 20,000 Hz is called ultrasonic sound. ... The sounds of frequency less than 20Hz are called infrasonics.

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