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.

Text Solution

Verified by Experts

The correct Answer is:
600 Hz, 421.1 Hz
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-WAVE MOTION-All Questions
  1. Two organ pipes at 16^@C produces 40 beats in 2.5 seconds. What happen...

    Text Solution

    |

  2. Two open organ pipes give 5 beats per second when sounded together in ...

    Text Solution

    |

  3. At 16^@C , two open organ pipes , when sounded together, produce 34 be...

    Text Solution

    |

  4. A policeman blows a whistle with a frequency of 500 Hz.A car approache...

    Text Solution

    |

  5. Calculate the apparent frequency of the horn of a car approaching a st...

    Text Solution

    |

  6. When a source moves away from a stationary observer, the frequency is ...

    Text Solution

    |

  7. A motor car is approaching towards a crossing with a velocity of 75 km...

    Text Solution

    |

  8. A railway engine and a car are moving on parallel tracks in opposite d...

    Text Solution

    |

  9. A policeman on duty detects a drop of 10% in the pitch of the horn of ...

    Text Solution

    |

  10. The whistle of an engine moving at 30km//h is heard by a motorist driv...

    Text Solution

    |

  11. A car passing a check post gives sound of frequency 1000 c.p.s. If the...

    Text Solution

    |

  12. The spectral line of wavelength lambda=5000 Å in the light coming from...

    Text Solution

    |

  13. Earth is moving towards a fixed star with a velocity of 30 kms^(-1). A...

    Text Solution

    |

  14. Find the intensity level of a sound wave that has an intensity of 10^(...

    Text Solution

    |

  15. The intensity level of a sound of intensity of 10^(-12)wat t//cm^(2) i...

    Text Solution

    |

  16. The intensity of sound at a point A is 10^(-4) Wm^(-2) and that at poi...

    Text Solution

    |

  17. The power output of a double speaker at a frequency of 60 Hz is 50 W.A...

    Text Solution

    |

  18. A hall has a volume of 10000 m^(3). Its total absorption is equivalent...

    Text Solution

    |

  19. Determine the frequency of the note F on the diatonic scale and on equ...

    Text Solution

    |

  20. Calculate the sum of the intervals used in a major diatonic scale.

    Text Solution

    |