Home
Class 11
PHYSICS
A car passing a check post gives sound o...

A car passing a check post gives sound of frequency 1000 c.p.s. If the velocity of the car is `72km//h` and of sound is `350m//s` , find the change is apparent frequency as it crosses the post.

Text Solution

Verified by Experts

The correct Answer is:
114.66 Hz
Promotional Banner

Topper's Solved these Questions

Similar Questions

Explore conceptually related problems

A train moving at 40 m/s, passes by a stationary observer, emitting a whistle of frequency 300 Hz. If the velocity of sound wave is 340 m/s, then the change in the apparent frequency of the sound, just before and after the train passes by the observer will be nearly

A source of sound is travelling with a velocity 40 km / hour towards observer and emits sound of frequency 2000 Hz . If velocity of sound is 1220 km / hour , then what is the apparent frequency heard by an observer

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:

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

A car, sounding a horn of frequency 1000 Hz, is moving directly towards a huge wall at a speed of 15 m/s. If speed of sound is 340 m/s, then the frequency of the echo heard by the driver is

A source of sound and a listener are moving towards each other . The velocity of the source is 20 m s^(-1) and that of the observer is 15 m s^(-1) . If the velocity of sound is 340 m s^(-1) and its frequency is 640 Hz, find the apparent frequency of the sound .

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

    |