2. Questions Bank
  3. JEE Main & Advanced
  4. Physics
  5. Wave Mechanics

JEE Main & Advanced Physics Wave Mechanics Question Bank Doppler's Effect

  • question_answer
    Suppose that the speed of sound in air at a given temperature  is 400 m/sec. An engine blows a whistle at 1200 Hz frequency. It is approaching an observer at the speed of 100 m/sec. What is the apparent frequency as heard by the observer                                            [CPMT 1983; DPMT 2001]

    A)            600 Hz                                     

    B)            1200 Hz

    C)            1500 Hz                                   

    D)            1600 Hz

    Correct Answer: D

    Solution :

               \[n'=n\,\left( \frac{v}{v-{{v}_{S}}} \right)=1200\,\left( \frac{400}{400-100} \right)=1600\,Hz\]


You need to login to perform this action.
You will be redirected in 3 sec spinner