Physics · 2013
JEE Main · 22 April 2013, Shift 1 · Q5
A and B are two sources generating sound waves. A listener is situated at C. The frequency of the source at A is 500 Hz. A, now, moves towards C with…
A and B are two sources generating sound waves. A listener is situated at C. The frequency of the source at A is $\displaystyle 500$ Hz. A, now, moves towards C with a speed $\displaystyle 4$ m/s. The number of beats heard at C is 6. When A moves away from C with speed $\displaystyle 4$ m/s, the number of beats heard at C is 18. The speed of sound is $\displaystyle 340$ m/s. The frequency of the source at B is :
Official answer
(3)
$\displaystyle 512$ Hz
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