Home
Class 11
PHYSICS
The frequency of the whistle of an engin...

The frequency of the whistle of an engine appears to drop to `(2)/(3)rd` of its actual value when it passes a stationary observer. Velocity of sound in air is 330 m/s then the speed of engine is

A

540 m/s

B

270 m/s

C

85 m/s

D

52.5 m/s

Text Solution

Verified by Experts

The correct Answer is:
C
`(f_(1))/(f_(2))=(V+V_(s))/(V-V_(s))`
`V_(s)=85 m//s`
Promotional Banner

Topper's Solved these Questions

  • SOUND WAVES

    RESONANCE ENGLISH|Exercise Solved Examples|24 Videos

  • SOUND WAVES

    RESONANCE ENGLISH|Exercise Board Level Exercise|33 Videos

  • SIMPLE HARMONIC MOTION

    RESONANCE ENGLISH|Exercise Exercise|28 Videos

  • STRING WAVES

    RESONANCE ENGLISH|Exercise Exercise|32 Videos

Similar Questions

Explore conceptually related problems

The apparent frequency of the whistle of an engine changes in the ratio 6:5 as the engine passes a stationary observer. If the velocity of sound is 330(m)/(s) , then the velocity of the engine is

The apparent frequency of the whistle of an engine changes in the ratio 6:5 as the engine passes a stationary observer. If the velocity of the sound is 330 m/s then the velocity of the engine will be

The ptich of the whistle of an engine appears to rise to 1,2 times the original value when it approaches a stationary observer. Calculate the speed of the engine if the speed of sound in air is 330 m/s. v'=((V)/(V-V_(S)))v

The frequency of the whistle of a train is observed to drop from 280 Hz to 260 Hz as the train moves away from a stationary listerner on the platform. Calculate the speed of the train, if speed of sound in air is 340 m/s.

A man standing on a platform observes that the frequency of the sound of a whistle emitted by a train drops by 140 Hz. If the velocity of sound in air is 330 m/s and the speed of the train is 70 m/s, the frequency of the whistle is

The difference between the apparent frequency of a source of sound as perceived by the observer during its approach and recession is 2% of the natural frequency of the source. If the velocity of sound in air is 300 m/s, the velocity of the source is

The ratio of the apparent frequencies of a car when approaching and receding a stationary observer is 11:9 What is the speed of the car, if the velocity of sound in air is 330 m/s?

Calculate the frequency of fifth harmonic of a closed organ pipe of length 50cm, if the velocity of sound in air is 330 m/s.

Calculate the frequency of fifth harmonic of a closed organ pipe of length 50cm, if the velocity of sound in air is 330 m/s.

An open organ pipe sounds a fundamental note of frequency 330 Hz. If the speed in air is 330 m/s then the length of the pipe is nearly

RESONANCE ENGLISH-SOUND WAVES-Exercise- 3 PART - I
  1. The frequency of the whistle of an engine appears to drop to (2)/(3)rd...

    Text Solution

    |

  2. An observer standing on a railway crossing receives frequencies 2.2 kH...

    Text Solution

    |

  3. An open pipe is in resonance in 2nd harmonic with frequency f(1). Now ...

    Text Solution

    |

  4. Two plane harmonic sound waves are expressed by the equations. y(1)(...

    Text Solution

    |

  5. Two plane harmonic sound waves are expressed by the equations. y(1)(...

    Text Solution

    |

  6. Two plane harmonic sound waves are expressed by the equations. y(1)(...

    Text Solution

    |

  7. Two trains A and B moving with speeds 20m//s and 30m//s respectively i...

    Text Solution

    |

  8. Two trains A and B are moving with speeds 20 m/s and 30 m/s, respectiv...

    Text Solution

    |

  9. Two trains A and B are moving with speeds 20 m//s respectively in the ...

    Text Solution

    |

  10. A vibrating string of certain length l under a tension T resonates wit...

    Text Solution

    |

  11. A student performed the experiment to measure the speed of sound in ai...

    Text Solution

    |

  12. A stationary source is emitting sound at a fixed frequency f(o), which...

    Text Solution

    |

  13. hollow pipe of length 0.8 m is closed at one end. At its open end a 0....

    Text Solution

    |

  14. A police car with a siren of frequency 8 kHz is moving with uniform ve...

    Text Solution

    |

  15. A person blows into the open-end of a long pipe. As a result, a high-p...

    Text Solution

    |

  16. A student is performing the experiment of resonance column. The diamet...

    Text Solution

    |

  17. Two vehicles, each moving with speed u on the same horizontal straight...

    Text Solution

    |

  18. A student is performing an experiment using a resonance column and a t...

    Text Solution

    |

  19. Four harmonic waves of equal frequency and equal intensity I(0) have p...

    Text Solution

    |

  20. An observer moves towards a stationary source of sound with a velocity...

    Text Solution

    |

  21. A whistle producing sound waves of frequencies 9500 Hz and above is ap...

    Text Solution

    |