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NEET Sample Paper NEET Sample Test Paper-52

  • question_answer
    A disc of radius R is rotating uniformly with angular frequency co. A source of sound is fixed to the rim of the disc. The ratio of maximum and minimum frequencies heard by stationary observer, far away from the disc and in the plane of disc is \[-\left( v=-speed\text{ }of\text{ }sound \right)\]

    A) \[\left( \frac{v}{v-R\omega } \right)\]                    

    B) \[\left( \frac{v}{v+R\omega } \right)\]

    C) \[\left( \frac{v-R\omega }{v+R\omega } \right)\]                

    D) \[\left( \frac{v+R\omega }{v-R\omega } \right)\]

    Correct Answer: D

    Solution :

    \[{{v}_{\max }}=\frac{v}{v-R\omega }\] \[{{v}_{\min }}=\frac{v}{v+R\omega }\] \[\frac{{{v}_{\max }}}{{{v}_{\min }}}=\frac{v+R\omega }{v-R\omega }\]


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