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NEET Sample Paper NEET Sample Test Paper-25

  • question_answer
    An observer moves towards a stationary source of sound with a speed l/5th of the speed of sound. The wavelength and frequency of the source emitted are\[\lambda \]and\[f\]respectively. The apparent frequency and wavelength recorded by the observer are respectively

    A) \[1.2\,f,\lambda \]                      

    B) \[f,1.2\,\lambda \]

    C) \[0.8f,0.8\lambda \]                    

    D) \[1.2\,f,1.2\,\lambda \]

    Correct Answer: A

    Solution :

     \[n'=\frac{v+{{v}_{0}}}{v}.n=\frac{v+v/5}{v}.f=\frac{6}{5}f=1.2f\]and since the source is stationary, so wave length remains unchanged for observer.


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