ICSE Class 10 Physics 2017 Solved Paper

Question : 51 of 65

Marks: +1, -0

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

1.3 {\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 {\m}

Solution:

Given :

f=256 {\Hz}, λ=1.3 {\m}

(1) We know,

{\V}\;= {\f} λ

\;=256 × 1.3

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

(2) Given:

λ^{'}=2.6 {\m}, f^{'}=

∵ \;\; f^{'}\;=\;{ {\V}}/{λ^{'}}=\;{332.8}/{2.6}

\;=128 {\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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