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A metal wire of linear mass density of 9.8 gm–1 is stretched between two supports 1 m apart with a tension of 10 kg wt. The wire passes at its middle point between poles of a permanent magnet, and it vibrates in resonance when carrying an alternating current of frequency n. The frequency n of a.c. source is
detailed solution
Correct option is B
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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 air is
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