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  • A source of sound producing wavelength 60 cm is moving away from a stationary observer with (1/6 th) the speed of the sound. Then what is the wavelength of sound recieved by the observer?<div c

A source of sound producing wavelength 60 cm is moving away from a stationary observer with (1/6 th) the speed of the sound. Then what is the wavelength of sound recieved by the observer?

Option: 1

60 cm


Option: 2

70 cm


Option: 3

75 cm


Option: 4

72 cm


Answers (1)

best_answer

Speed of the sound wave = v

Speed of the source , v_{s}= \frac{v}{6}

\begin{aligned} & \lambda^{\prime}=\frac{\left(v+v_s\right) \lambda}{v}=\frac{\left(v+\frac{v}{6}\right) \lambda}{v}=\frac{7}{6} \cdot \lambda \\ & \lambda^{\prime}=\frac{7}{6} \times 60=7 \times 10 \\ & \lambda^{\prime}=70 \mathrm{~cm} \end{aligned}

Posted by

jitender.kumar

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