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NEET NEET SOLVED PAPER 2017

  • question_answer
    Two cars moving in opposite directions approach each other with speed of 22 m/s and 16.5 m/s respectively. The driver of the first car blows a horn having a frequency 400 Hz. The frequency heard by the driver of the second car is [velocity of sound 340 m/s]

    A)  448 Hz                 

    B)  350 Hz

    C)   361 Hz                                

    D)   411 Hz

    Correct Answer: A

    Solution :

                     \[{{f}_{A}}=f\left[ \frac{v+{{v}_{0}}}{v-{{v}_{s}}} \right]\]                 \[=400\left[ \frac{340+16.5}{340-22} \right]\]                 \[{{f}_{A}}=448Hz\]


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