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Question

# An ultrasonic source emits sound of frequency 220 kHz in air. If this sound meets a water surface, what is the wavelength of the reflected sound?

A
1.6×103m
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B
2.6×103m
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C
3.6×103m
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D
4.6×103m
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Solution

## The correct option is A 1.6×10−3mHere, v=220kHz=220×103=2.2×105Hz;Speed of sound in air, va=352ms−1Speed of sound in water, vw=1.496ms−1The reflected sound: After reflection, the ultrasonic sound continues to travel in air. If λa is wave length in air, thenλa=vav=3522.2×105=1.6×10−3m

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