Class 9 · Science · Exploration

10. Sound Waves: Characteristics and Applications

Try question 1

Sound cannot travel through

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Answer and explanation

Answer: D. vacuum

Sound needs a medium of particles to travel.

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Try question 2

The SI unit of frequency is the

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Answer and explanation

Answer: A. hertz

1 Hz = one vibration per second.

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Try question 3

The audible range of frequencies for humans is about

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Answer and explanation

Answer: B. 20 Hz – 20,000 Hz

Humans hear roughly between 20 Hz and 20 kHz.

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