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$\frac{2 u }{\lambda}$
  • D$\sqrt{ u \lambda}$
AIPMT 2000, Diffcult
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