Two whistles $A$ and $B$ each have a frequency of $500\,\,Hz$. $A$ is stationary and $B$ is moving towards the right (away from $A$) at a speed of $50\,\, m/s$. An observer is between the two whistles moving towards the right with a speed of $25\,\, m/s.$ The velocity of sound in air is $350 \,\,m/s$. Assume there is no wind. Then which of the following statements are true:
Diffcult
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Applying Doppler's effect equation,
$n_{A}^{\prime}=\frac{350-25}{350} 500=464.28 \mathrm{Hz}$
$n_{B}^{\prime}=\frac{350+25}{350+50} 500=468.75 H z$
options $"B"$ and $"C"$ are correct.
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