Home
Class 12
PHYSICS
A train moving at a speed of 220ms^-1 to...

A train moving at a speed of `220ms^-1` towards a stationary object emits a sound of frequency 1000 Hz. Some of the sound reaching the object gets reflected back to the train as echo. The frequency of the echo as detected by the driver of the train is (speed of sound in air is `330ms^(-1)`)

A

4000 Hz

B

5000 Hz

C

3000 Hz

D

3500 Hz

Text Solution

Verified by Experts

The correct Answer is:
B
`n'=n((v+v_(s))/(v-v_(s)))`
`=1000((330+220)/(330-220))`
`=1000((550)/(110))`
`=5000Hz`
Promotional Banner

Topper's Solved these Questions

  • NEET

    NEET PREVIOUS YEAR (YEARWISE + CHAPTERWISE)|Exercise QUESTION|95 Videos

  • NEET

    NEET PREVIOUS YEAR (YEARWISE + CHAPTERWISE)|Exercise MCQ|95 Videos

  • NEET

    NEET PREVIOUS YEAR (YEARWISE + CHAPTERWISE)|Exercise MCQ|95 Videos

  • MOTION IN TWO AND THREE DIMENSION

    NEET PREVIOUS YEAR (YEARWISE + CHAPTERWISE)|Exercise All Questions|47 Videos

  • NEET 2020

    NEET PREVIOUS YEAR (YEARWISE + CHAPTERWISE)|Exercise All Questions|45 Videos

Similar Questions

Explore conceptually related problems

A rocket is moving at a speed of 200ms^(-1) towards a stationary target. While moving, it emits a wave of frequency 1000hz. Some of the sound reaching the target gets reflected back to the racket as an echo. Calculate the frequency of sound as detected by the person at the position of tartget and frequecny of echo as detected by the rocket . Given velocity of soun =330ms^(-1) .

Towards a stationary object, a train is moving with a speed of 300 m/s and emits a sound wave of frequency 2000 Hz. Small percentage of the sound is reflected back to train in the form of echo. The frequency of the echo as detected by a person sitting in the train will be (speed of sound is 340 m/s).

A rocket is moving at a speed of 220 ms^(-1) towards a stationary target. While moving, it emits a wave of frequency 500 Hz. What is the frequency of the sound as detected by the target?

A car is moving with 90 km h^(-1) blows a horn of 150 Hz, towards a cliff. The frequency of the reflected sound heard by the driver will be (speed of sound in air is 340 ms^(-1) )

What is the minimum distance between the reflector and the listener to hear the echo, when the speed of sound in air is 330 ms^(-1) ?

NEET PREVIOUS YEAR (YEARWISE + CHAPTERWISE)-NEET-PHYSICS
  1. Lights of two different frequencies whose photons have energies 1 and ...

    Text Solution

    |

  2. The moment of inertia of a uniform circular disc is maximum about an a...

    Text Solution

    |

  3. A train moving at a speed of 220ms^-1 towards a stationary object emit...

    Text Solution

    |

  4. The half-life of a radioactive nucleus is 50 days. The time interval (...

    Text Solution

    |

  5. A car of mass m is moving on a level circular track of radius R if mu(...

    Text Solution

    |

  6. A circular platform is mounted on a frictionless vertical axle. Its ra...

    Text Solution

    |

  7. If the momentum of an electron is changed by p, then the de - Broglie ...

    Text Solution

    |

  8. If v(e) is escape velocity and v(0), is orbital velocity of satellite ...

    Text Solution

    |

  9. The equation of a simple harmonic wave is given by y = 3 sin"(pi)/(2)...

    Text Solution

    |

  10. A proton carrying 1 MeV kinetic energy is moving in a circular path of...

    Text Solution

    |

  11. Three masses are placed on the x-axis : 300 g at origin. 500 g at x = ...

    Text Solution

    |

  12. In a coil of resistance 10 Omega, the induced current developed by cha...

    Text Solution

    |

  13. A parallel plate capacitor of plate area A and plates separation dista...

    Text Solution

    |

  14. A car of mass m starta from rest and accelerates so that the instyanta...

    Text Solution

    |

  15. Which one of the following plots represents the variation of the gravi...

    Text Solution

    |

  16. The input resistance of a silicon transistor is 100 Omega. Base curren...

    Text Solution

    |

  17. For the angle of minimum deviation of a prism to be equal to its refr...

    Text Solution

    |

  18. The transition form the state n = 3 to n = 1 in a hydrogen-like atom r...

    Text Solution

    |

  19. A rod of length 10 cm lies along the principal axis of a concave mirro...

    Text Solution

    |

  20. A slab of stone of area of 0.36 m^(2) and thickness 0.1 m is exposed o...

    Text Solution

    |