ICSE Class 10 Physics 2020 Paper

Question : 18 of 67

Marks: +1, -0

A sound wave travelling in water has wavelength

0.4\ \mathrm{m}

Is this wave audible in air? (The speed of sound in water

=1400\ \mathrm{ms}^{-1}

)

Solution:

Given :

\lambda=0.4\ \mathrm{m},\ v=1400\ \mathrm{ms}^{-1}

We know,

v=f\lambda

f=\frac{v}{\lambda}=\frac{1400}{0\cdot 4}=3500\ \mathrm{Hz}

Yes. Since the value of

f

lies in the audibility range

(20\ \mathrm{Hz}

20,000\ \mathrm{Hz})

, so the sound wave is audible in air.

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