Home
Class 11
PHYSICS
A policeman blows a whistle with a frequ...

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)`.

Text Solution

Verified by Experts

The correct Answer is:
50 Hz
Promotional Banner

Topper's Solved these Questions

Similar Questions

Explore conceptually related problems

A policeman blos a whistle of frequency 400Hz as a car speeds past him with a velocity of 54km h^(-1) . Find the cahnge in frequency as heard by the driver of the car just as he passes the policeman. Velocity of sound in air is 350ms^(-1)

A policemen blows a whistle of frequency 330 Hz as a car speeds and passed him with avelocity 18 km per hour. Find the change in frequency as heard by the driver of the car just as he passes the police man (Velocity of sound = 320 m//s)

A car has two horns having a difference in frequency of 180 Hz. The car is approaching a stationary observer with a speed of 60 ms^(-1) . Calculate the difference in frequencies of the notes as heard by the observer, If velocity of sound in air is 330 ms^(-1) .

A traffic policeman standing on a road sounds a whistle emitting the main frequency of 2.00 kHz. What could be the apparent frequency heard by a scooter driver approaching the policeman at a speed of 36.0km h^(-1) ? Speed of sound in air =340 m s^(-1).

A source producing sound of frequency 170 Hz is approaching a stationary observer with a velocity 17 ms^(-1) . The apparent change in the wavelength of sound heard by the observer is (speed of sound in air = 340 ms^(-1) )

A person standing on one side of a road blows a whistle which has a frequency of 600 Hz . A cyclist passes at 16 kilometre per hour. What does the frequency of the whistle appear to be to the cyclist before and after passing ? (Velocity of sound in air = 350 ms^(-1) )

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 man is travelling in a train towards the station with a speed of 50 m/s. calculate the apparent frequency heard by him of whistle which is blown at the station with a frequency 200 Hz. Velocity of sound in air is 350 m/s.

Calculate the apparent frequency of the horn of a car approaching a stationary listener with a velocity of 12 ms^(-1) . The frequency of horn is 500 Hz.The speed of sound is 332 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

    |