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NEET Sample Paper NEET Sample Test Paper-60

  • question_answer
    A person is observing two trains one coming towards him and other leaving with the same velocity 4m/s. If their whistling frequencies are 240Hz each, then the number of beats per second are heard by the person will be: (velocity of sound = 320m/s)

    A) 3                     

    B) 6       

    C) 9                     

    D) Zero

    Correct Answer: D

    Solution :

    [c] Potential energy \[=\frac{K}{2}\] \[mg{{h}_{1}}=\frac{1}{2}\times 490\] \[2\times 9.8\times {{h}_{1}}=\frac{490}{2}\] \[{{h}_{1}}=12.5m\]


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