ICSE Class 10 Physics 2017 Solved Paper
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Question : 51
Total: 65
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 wavelength2.6 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
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 ′ =
=
= 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.
(1) We know,
(2) Given:
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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