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
    The wavelength is 120 cm when the source is stationary. If the source is moving with relative velocity of 60 m/sec towards the observer, then the wavelength of the sound wave reaching to the observer will be (velocity of sound = 330 m/s)

    A)            98 cm                                      

    B)            140 cm

    C)            120 cm                                    

    D)            144 cm

    Correct Answer: A

    Solution :

               \[{n}'=n\,\left( \frac{v}{v-{{v}_{s}}} \right)\] Þ \[{\lambda }'=\lambda \left( \frac{v-{{v}_{S}}}{v} \right)\]            Þ \[{\lambda }'=120\,\left( \frac{330-60}{330} \right)=98\,cm.\]


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