Q.

A source of sound of frequency 600 Hz is placed inside water. The speed of sound in water is 1500 m/s and in air is 300 m/s. The frequency of sound recorded by an observer who is standing in air is

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a

200 Hz

b

3000 Hz

c

120 Hz

d

600 Hz

answer is D.

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Detailed Solution

Frequency of sound does not change with medium, because it is characteristics of source.
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A source of sound of frequency 600 Hz is placed inside water. The speed of sound in water is 1500 m/s and in air is 300 m/s. The frequency of sound recorded by an observer who is standing in air is