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  • The wave length is  when the source  is stationary . If

The wave length is \mathrm{\perp 20 cm} when the source  is stationary . If the source is moving with relative velocity of 60 m/s.towards the observer , then the wavelength of sound wave reaching to the observer will be (velocity of sound = 330 m/s) -

 

Option: 1

98 cm


Option: 2

140 cm


Option: 3

120 cm


Option: 4

1440 cm


Answers (1)

best_answer

\mathrm{\begin{gathered} n^{\prime}=n\left(\frac{v}{V-V_s}\right) \Rightarrow \lambda^{\prime}=\lambda\left(\frac{V-V_s}{v}\right) \\ \lambda^{\prime}=120\left(\frac{330-60}{330}\right) \\ \lambda^{\prime}=98 \mathrm{~cm} \end{gathered}}

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Anam Khan

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