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BCECE Engineering BCECE Engineering Solved Paper-2013

  • question_answer
    A car is moving towards a high cliff. The car driver sounds a horn of frequency \[f.\]The reflected sound heard by the driver has the frequency \[2f.\] If \[\upsilon \]be the velocity of sound, then the velocity of the car, in the same velocity units will be

    A)  \[\frac{v}{\sqrt{2}}\]                                    

    B)         \[\frac{v}{2}\]                  

    C)         \[\frac{v}{3}\]                                  

    D)         \[\frac{v}{4}\]

    Correct Answer: C

    Solution :

    We have, \[v=\frac{v+{{v}_{s}}}{v-{{v}_{s}}}v\] or            \[2f=\frac{v+{{v}_{s}}}{v-{{v}_{s}}}f\]  or           \[2(v-{{v}_{s}})=v+{{v}_{s}}\] or            \[2v-2{{v}_{s}}=v+{{v}_{s}}\] \[\therefore \]  \[v=3{{v}_{s}}\] or            \[{{v}_{s}}=\frac{v}{3}\]


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