Chapter 11

NCERT
Class 9
Science
Solutions
13. A sound wave travels at a speed of 339 ms–1. If it’s wavelength is 1.5 cm, what is the frequency of the wave? Will it be audible?

Question:

A sound wave travels at a speed of 339 ms–1. If it’s wavelength is 1.5 cm, what is the frequency of the wave? Will it be audible?

Answer:

Here v = 339 m/s., λ= 1.5 cm = 1.5 × 10–2m, V = ?

We know that, V = v / λ

V = 339 / (1.5 X 10-2)

V = 22600 Hz

It is not audible to the human ear, because the audible limit is 20,000 Hz

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