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, it is 300 m/s. The frequency of sound recorded by an observer who is standing in the air is:

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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, it is 300 m/s. The frequency of sound recorded by an observer who is standing in the air is: