A source of sound of frequency \( 600 \mathrm{~Hz} \) is placed ins...

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A source of sound of frequency \( 600 \mathrm{~Hz} \) is placed inside water. The speed of sound in water is \( 1500 \mathrm{~m} / \mathrm{s} \) and in air is \( 300 \mathrm{~m} / \mathrm{s} \). The frequency of sound recorded by an observer who is standing in air is
[IIT-JEE (Screening) 2004]
\( \mathrm{P} \)
(a) \( 200 \mathrm{~Hz} \)
(b) \( 3000 \mathrm{~Hz} \)
(c) \( 120 \mathrm{~Hz} \)
(d) \( 600 \mathrm{~Hz} \)
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