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CET Karnataka Medical CET - Karnataka Medical Solved Paper-2014

  • question_answer
    A train is approaching towards a platform with a speed of \[10m\text{ }{{s}^{-1}}\]while blowing a whistle of frequency 340 Hz. What is the frequency of whistle heard by a stationary observer on the platform? Given speed of sound \[=340m\text{ }{{s}^{-1}}\].

    A)  \[340Hz\]       

    B)  \[330Hz\]

    C)  \[360Hz\]        

    D)  \[350Hz\]

    Correct Answer: D

    Solution :

    : Here, Speed of train, \[{{v}_{T}}=10\,m\,\,{{s}^{-1}}\] Speed of sound, \[v=340\,m\,\,{{s}^{-1}}\] Frequency of whistle, \[\upsilon =340\,Hz\] The frequency of whistle heard by the stationary observer on the platform is \[\upsilon =\upsilon \left( \frac{v}{v-{{v}_{T}}} \right)=340\left( \frac{340}{340-10} \right)\] \[=340\left( \frac{340}{340-10} \right)=350Hz\]


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