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BVP Medical BVP Medical Solved Paper-2011

  • question_answer
    The disc of siren has n holes and the frequency of its rotation is 300 rev/m. It produces a note of wavelength 2.4 m. When the velocity of sound in air is 360 m/s. The value of n is

    A)  24                                         

    B)  36    

    C)  5                                            

    D)  30

    Correct Answer: D

    Solution :

                    Frequency \[{{v}_{H}}>{{v}_{N}}>{{v}_{o}}\] Also, v = number of holes x number of rev/s Given, \[{{v}_{o}}>,{{v}_{N}}\,=\,{{v}_{H}}\] \[{{v}_{o}}>,{{v}_{H}}\,=\,{{v}_{N}}\]     \[{{v}_{N}}>,{{v}_{o}}\,=\,{{v}_{H}}\]                 \[=1.013\times {{10}^{5}}N/{{m}^{2}}\] \[\overset{0}{\mathop{A}}\,\]  \[\overset{0}{\mathop{A}}\,\]


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