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CEE Kerala Engineering CEE Kerala Engineering Solved Paper-2010

  • question_answer
    A whistle is blown from the tower of a factory with a frequency of 220 Hz. The apparent frequency of sound heard by a worker moving towards the factory with a velocity of\[30\text{ }m{{s}^{-1}}\] is (velocity of sound\[=330\text{ }m{{s}^{-1}}\])

    A)  280 Hz                 

    B)         200 Hz

    C)  300 Hz                 

    D)         240 Hz

    E)  330 Hz

    Correct Answer: D

    Solution :

    Apparent frequency \[{{f}_{a}}=\frac{(v+{{v}_{L}})}{v}\times f\] \[=\frac{330+30}{330}\times 220\]           \[=240\text{ }Hz\]


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