State the approximate speed of ultrasound in air.
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The approximate speed of ultrasound in air is 330 m s-1 .
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Name the sounds of the frequencies given below —
(a) 10 Hz
(b) 100 Hz
(c) 1000 Hz
(d) 40 kHz
What is ultrasound?
Can you hear the sound produced due to vibrations of a seconds’ pendulum? Give reason.
State two properties of ultrasound that make it useful to us.