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Question -

A bat emits ultrasonic sound of frequency 1000 kHz in air. If the sound meets a water surface, what is the wavelength of (a) the reflected sound, (b) the transmitted sound? Speed of sound in air is 340 m s–1 and in water 1486 m s–1.



Answer -

(a) Frequency of the ultrasonic sound, ν = 1000 kHz = 106 Hz

Speed of sound in air, va =340 m/s

The wavelength (λr) ofthe reflected sound is given by the relation:

(b) Frequency of the ultrasonic sound, ν = 1000 kHz = 106 Hz

Speed of sound in water, vw =1486 m/s

The wavelength of the transmitted sound is given as:

 =1.49 × 10–3 m

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