A certain sound has a frequency of 256 hertz ...

ICSE Class 10 Physics 2017 Paper

Question : 51 of 65

Marks: +1, -0

A certain sound has a frequency of 256 hertz and a wavelength of

1.3 \text{m}

1. Calculate the speed with which this sound travels.

2. What difference would be felt by a listener between the above sound and another sound travelling at the same speed, but of wavelength

2.6 \text{m}

Solution:

Given :

f=256 \text{Hz}, \lambda=1.3 \text{m}

(1) We know,

V\; = f \lambda

\;=256 \times 1.3

\;=332.8 \mathrm{ms}^{-1}

(2) Given:

\lambda' = 2.6 \text{m}, f' =

\because\;\; f' = \frac{V}{\lambda'} = \frac{332.8}{2.6}

\;=128 \text{Hz}

Since, the frequency of sound decreases, so it will appear to the listener having less pitch (or strillness) as compared to the previous sound.

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