Home
Class 11
PHYSICS
A train moves towards a stationary obser...

A train moves towards a stationary observer with speed `34 m//s`. The train sounds a whistle and its frequency registered by the observer is `f_(1)`. If the train's speed is reduced to `17 m//s`, the frequency registered is `f_(2)`. If the speed of sound of `340 m//s`, then the ratio `f_(1)//f_(2)`is

A

`18//19`

B

`1//2`

C

`2`

D

`19//18`

Text Solution

Verified by Experts

The correct Answer is:
D
Promotional Banner

Topper's Solved these Questions

  • SOUND WAVES

    RESONANCE|Exercise Exercise- 2 PART - II|20 Videos

  • SOUND WAVES

    RESONANCE|Exercise Exercise- 2 PART - III|21 Videos

  • SOUND WAVES

    RESONANCE|Exercise Exercise- 1 PART - II|30 Videos

  • SIMPLE HARMONIC MOTION

    RESONANCE|Exercise Exercise|28 Videos

  • STRING WAVES

    RESONANCE|Exercise Exercise|32 Videos

Similar Questions

Explore conceptually related problems

A train moves towards a stationary observer with speed 34 m//s . The train sounds a whistle and its frequency registered by the obsrever is f_(1) . If the train's speed is reduced to 17 m//s , the freuqncy registered is f_(2) . If the speed of sound of 340 m//s , then the ratio f_(1)//f_(2) is

A train moves towards a stationary observer with speed 34 m/s. The train sounds a whistle and its frequency registered by the observer is f_(1) . If the speed of train is reduced to 17 m/s, the frequency registered is f_(2) . If speed fo sound is 340 m/s, then the ratio f_(1)//f_(2) is :

A train moves towards a stationary observer with a speed of 40 m/s. The observer records the frequency of the train's whistle as f_(1) . But when the train's speed is reduced to 20 m/s, the frequency of the whistle recored by him is f_(2) . What is the ratio (f_(1))/(f_(2)) , if the speed of sound in air is 340 m/s ?

A source of sound of frequency n is moving towards a stationary observer with a speed S. If the speed of sound in air is V and the frequency heard by the observer is n_(1) ,the value of n_(1)//n is

a bus is moving towards and stationary observer with speed 20 m/s blows a horn of frequency 200 Hz. the frequency of sound heard by the observer is approximately ( take speed of sound 320 m/s)

RESONANCE-SOUND WAVES-Exercise- 2 PART - I
  1. The displacement of the medium in a sound wave is given by the equatio...

    Text Solution

    |

  2. The ratio of the speed of sound in nitrogen gas to that in helium gas,...

    Text Solution

    |

  3. Two monoatomic ideal gases 1 and 2 of molecular masses m(1) and m(2) r...

    Text Solution

    |

  4. A closed pipe resonates at its fundmental frequency of 300 Hz. Which o...

    Text Solution

    |

  5. A closed organ pipe and an open organ pipe have their first overtones ...

    Text Solution

    |

  6. An open pipe is suddenly closed at one end with the result that the fr...

    Text Solution

    |

  7. There is a set of four tuning forks , one with the lowest frequency vi...

    Text Solution

    |

  8. Two second sources produce progressive waves given by y(1) = 12 cos 10...

    Text Solution

    |

  9. A fixed source of sound emitting a certain frequency appears as f(a) w...

    Text Solution

    |

  10. When a train approaches a stationary observer, the apparent frequency ...

    Text Solution

    |

  11. A police car moving at 22 m/s, chases a motorcylist. The police man so...

    Text Solution

    |

  12. A siren placed at a railway platform is emitting sound of frequency 5 ...

    Text Solution

    |

  13. A train moves towards a stationary observer with speed 34 m//s. The tr...

    Text Solution

    |

  14. A train blowing its whistle moves with a constant velocity v away from...

    Text Solution

    |

  15. In the case of sound waves, wind a blowing from source to reciver with...

    Text Solution

    |

  16. Two sound sources emitting sound each of wavelength lambda are fixed a...

    Text Solution

    |

  17. A source on a swing which is covering an angle theta from the vertical...

    Text Solution

    |

  18. A car is approching a railway crossing at a speed of 72 kmph. It sound...

    Text Solution

    |

  19. Two identical source moving parallel to each other at seperation 'd' a...

    Text Solution

    |

  20. A source which is emitting sound of frequency f is initially at (-r,0)...

    Text Solution

    |