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Questions  >>  JEEMAIN and NEET  >>  NEET PAST PAPERS  >>  2000
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Q)

Two stationary sources each emitting waves of wave length $\lambda$. An observer moves from one source to other with velocity u. Then number of beats heared by him :


( A ) $\frac{u}{2\lambda}$
( B ) $\frac{u}{\lambda}$
( C ) $\sqrt u\lambda$
( D ) $\frac{2u}{\lambda}$

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