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NEET Sample Paper NEET Sample Test Paper-6

  • question_answer
    A siren placed at a railway platform is emitted sound of frequency 5KHz. A passenger sitting in a moving train A records a frequency of \[5.5\text{ }KHz,\]while the train approaches the siren. During his return journey in a different train B, he records a frequency of \[6.0\text{ }KHz\] while approaching the same siren. The ratio of the velocity of train B to that train A is:

    A)  \[242/252\]                 

    B)  2

    C)  \[5/6\]                         

    D)  \[11/6\]

    Correct Answer: B

    Solution :

    Using the formula,  \[f=f\left( \frac{V+{{V}_{0}}}{V} \right)\] In First case, we get \[5.5=5\left( \frac{V+{{V}_{A}}}{V} \right)\]   ?.(i) and in second case, we get \[6.0=5\left( \frac{V+{{V}_{B}}}{V} \right)\]                         ...(ii) From equations (i) and (ii) we have             \[\frac{{{V}_{B}}}{{{V}_{A}}}=2\]


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