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Question

# A bat emits ultrasonic sound of frequency 100kHz in air. If this sound meets a water surface, the wavelength of the reflected and transmitted sound are (Speed of sound in air =340ms−1 and in water =1500ms−1)

A
3.4mm,30mm
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B
6.8mm,15mm
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C
3.4mm,15mm
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D
6.8mm,30mm
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Solution

## The correct option is C 3.4mm,15mmHere, υ=100kHz=100×103Hz =105Hz=105s−1νa=340ms−1,νw=1500ms−1Frequency of both the reflected and transmitted sound remains unchanged.Wavelength of transmitted sound,λa=νaυ=340ms−1105s−1=34×10−4m =3.4×10−3mWavelength of transmitted sound,λw=νwυ=1500ms−1105s−1=15×10−3m=15mm

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