Home
Class 11
PHYSICS
A railway engine and a car are moving on...

A railway engine and a car are moving on parallel tracks in opposite directinos with speeds of `144km//hr` and `72km//h` respectively. The engine is continously sounding a whistle of frequency 500Hz. The velocity of sound in `340ms^(-1)`. Calculate the frequency of sound heard in the car when
(i) the car and engineare approaching one another,
(ii) the two are moving away from one another.

Promotional Banner

Topper's Solved these Questions

Similar Questions

Explore conceptually related problems

A car and bike are moving in opposite directions on parallel tracks with speeds of 72 km/h and 60 km/h respectively. A boy sitting in car is continuously sounding a whistle of frequency 400 Hz. Calculate the frequency of sound heard by person sitting on bike (a) if car and bike are approaching each other. (b) if car and bike are moving away from each other.

The driver of a car travelling with speed 30ms^-1 towards a hill sounds a horn of frequency 600 Hz. If the velocity of sound in air is 330ms^-1 , the frequency of reflected sound as heard by driver is

The driver of a car travelling with a speed of 30 m/s towards a wall sounds a siren of frequency 500 Hz. If the velocity of sound in air is 330 m/s, then the frequency of the sound reflected from the wall and as heard by the driver is

An engine standing at the platform blows a whistle of frequency 305 Hz. If the velocity of sound be 1220 km/h, the frequency of the whistle as heard by a man running towards the engine with a speed of 20 km/s is

Two trains are moving towards each other on parallel tracks at speeds of 144kmph and 54kmph . The first train sounds a whistle of frequency 600Hz . Frequency of the whistle as heard by a passenger in the second train is ( V=340m//s )

A car is moving along X-axis with a velocity v=20m//s . It sounds a whistle of frequency 660 Hz. If the speed of sound is 340m//s . The apparent frequency heard by the observer O (shown in figure) is:

Two cars moving in opposite directio approach each other with speed of 22m//s and 16.5m//s respectively . The driver of the first car blows a horn having a frequency 400Hz . The frequency heard by the driver of the second car is [ velocity of the sound 340m//s]

Two car moving in opposite directions approach each other with speed of 22m//s and 16.5m//s respectively. The driver of the first car blows a horn having a frequency 400 Hz . The frequency heard by the driver of the second car is [velocity of sound 340m//s ].

An engine blowing a whistle of frequency 133 Hz moves with a velocity of 60(m)/(s) towards a hiss from which an echo is heard. Calculate the frequency of the echo heard by the driver. (velocity of sound in air in 340(m)/(s) .)

A policeman blows a whistle with a frequency of 500 Hz.A car approaches him with a velocity of 15 ms^(-1) .Calculate the change in frequency as heard by the driver of the car as he passes the policeman.Speed of sound in air is 300 ms^(-1) .

SL ARORA-Waves-EXERCISE
  1. A railway engine and a car are moving on parallel tracks in opposite d...

    Text Solution

    |

  2. A radio station broadcasts its programme at 219.3 metre wavelength. De...

    Text Solution

    |

  3. The audible range of a human ear is 20 Hz to 20 kHz. Convert this into...

    Text Solution

    |

  4. The speed of a wave in a mediium is 960ms^(-1). If 3600 waves are pass...

    Text Solution

    |

  5. If the splash is hear 4.23 seconds after a stone is dropped into a wel...

    Text Solution

    |

  6. A stone is dropped into a well and its splash is heard at the mouth of...

    Text Solution

    |

  7. A body sends waves 100mm long through medium A and 0.25m long in mediu...

    Text Solution

    |

  8. A steel wire 70cm long has a mass of 7.0g. If the wire is under a tens...

    Text Solution

    |

  9. The speed of a transverse wave in a stretched string is 348 ms^(-1), w...

    Text Solution

    |

  10. Calculate the velocity of transverse wave in a copper wire 1 mm^(2) in...

    Text Solution

    |

  11. A wave pulse is travelling on a string of linear mass density 1.0 g cm...

    Text Solution

    |

  12. The diameter of an iron wire is 1.20 mm. If the speed of transverse wa...

    Text Solution

    |

  13. The speed of sound in a liquid is 1500 ms^(-1).The density of the liqu...

    Text Solution

    |

  14. The longitudinal waves starting from a ship return from the bottom of...

    Text Solution

    |

  15. At 10^5 Nm^(-2) atmospheric pressure the density of air is 1.29 kg m^(...

    Text Solution

    |

  16. At normal temperature and pressur, 4g of He occupies a volume of 22.4 ...

    Text Solution

    |

  17. Find the temperature at which the velocity of sound in air will be 1 1...

    Text Solution

    |

  18. The velocity of sound in air is 332 ms^(-1) at 0^@ C .At what temperat...

    Text Solution

    |

  19. The ratio of the velocity of sound in Hydrogen gas (gamma=7/5) to that...

    Text Solution

    |

  20. An observer sets his watch by the sound of a signal fired from a tower...

    Text Solution

    |

  21. A sound wave propagating in air has a frequency of 4000Hz. Calculate t...

    Text Solution

    |