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AMU Medical AMU Solved Paper-2005

  • question_answer
    A vehicle with horn of frequency v is moving with a velocity of 30 m/s in a direction perpendicular to the line joining the observer and the vehicle. The observer perceives the sound to have a frequency \[\left( \text{v }+\text{ }{{\text{v}}_{\text{1}}} \right).\] If the sound velocity in air is 30 m/s, then

    A) \[{{v}_{1}}=0\]                                 

    B)  \[{{v}_{1}}=0.1v\]

    C) \[{{v}_{1}}=-0.1v\]                          

    D)  \[{{v}_{1}}=10\,v\]

    Correct Answer: A

    Solution :

                     The apparent changes in the frequency of the source due to relative motion between the source and observer is known as Dopplers effect. In the given case source is moving in a direction perpendicular to the straight line which joins the observer, hence there is no relative motion between them, therefore Dopplers effect will not occur, thus frequency\[{{v}_{i}}=0\].


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