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NEET 2003
Exam
NEET
Year
2003
Subject
Physics
Chapter
Waves and Sound

NEET 2003 · Physics · Waves and Sound

An observer moves towards a stationary source of sound with a speed...

An observer moves towards a stationary source of sound with a speed 1/5th of the speed of sound. The wavelength and frequency of the source emitted are λ\lambda and ff respectively. The apparent frequency and wavelength recorded by the observer are respectively:

Options

  1. A1.2f,1.2λ1.2 f, 1.2 \lambda
  2. B1.2f,λ1.2 f, \lambda
  3. Cf,1.2λf, 1.2 \lambda
  4. D0.8f,0.8λ0.8 f, 0.8 \lambda

Correct answer

B. 1.2f,λ1.2 f, \lambda

Step-by-step solution

Source is stationary⇒λ= constants  and f′=V+VsVf=(1+VsV)f=(1+15)f=1.2f\begin{aligned}& \Rightarrow \lambda=\text{ constants }\\ & \text{ and }f^{\prime}=\frac{V+V_{\mathrm{s}}}{V}f=\left(1+\frac{V_{\mathrm{s}}}{V}\right)f \\ & =\left(1+\frac{1}{5}\right)f=1.2 f \end{aligned}
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