Home
Class 11
PHYSICS
A police car moving at 22(m)/(s) chases ...


A police car moving at `22(m)/(s)` chases a motorcyclist. The police man sounds his horn of frequency 176 Hz, while both of them move towards a stationary siren of frequency 165 Hz. Calculate the speed of motorcyclist if it is given that he does not hear any beat (speed of sound in air is `330(m)/(s)`)

A

`33(m)/(s)`

B

`22(m)/(s)`

C

`11(m)/(s)`

D

zero

Text Solution

Verified by Experts

The correct Answer is:
C
`n_1=n_2implies(v-v_m)/(v-v_C)n'=(v+v_m)/(v)n`
`implies(v-v_m)/(v-22)xx176=(v+v_m)/(v)xx165`
`impliesn_m=22(m)/(s)`
Promotional Banner

Topper's Solved these Questions

  • SOUND WAVES AND DOPPLER EFFECT

    CENGAGE PHYSICS ENGLISH|Exercise Multiple Correct|44 Videos

  • SOUND WAVES AND DOPPLER EFFECT

    CENGAGE PHYSICS ENGLISH|Exercise Assertion-Reasoning|24 Videos

  • SOUND WAVES AND DOPPLER EFFECT

    CENGAGE PHYSICS ENGLISH|Exercise Subjective|56 Videos

  • RIGID BODY DYNAMICS 2

    CENGAGE PHYSICS ENGLISH|Exercise Interger|2 Videos

  • SUPERPOSITION AND STANDING WAVES

    CENGAGE PHYSICS ENGLISH|Exercise Comprehension Type|5 Videos

Similar Questions

Explore conceptually related problems

A police car moving at 22m//s , chases a motorcyclist, the police man sounds his horn at 176 Hz , while both of them move towards a stationary siren of frequency 165 H z. Calculate the speed of the motorcycle, if it is given that he does not observes any beat

A police car moving at 22 m//s , chase a motoclist. The police man has horn at 176 H_(Z) , While both of them move towards a stationary siran of frequency 165 H_(Z) . Calulate the speed of the motorcyclist, if he does not observer any beats. (velocity of sound in air = 330 m//s)

A police car moving at 22 ms^(-1) chases a motor cyclist. The police man sounds horn at 176 Hz. While both of them move towards a stationary siren of frequency 165 Hz. If the number of beats heard by the motor cyclist per second is zero, then the speed of motorcycle is (Speed of sound in air = 330 ms^(-1) )

A police car moving at "30 m s"^(-1) , chases a motorcyclist. The policeman sounds his horn at 180 Hz, while both of them move towards a stationary siren of frequency 160 HZ. He does not observe any beats then, calculate the speed ("in m s"^(-1)) of the motorcyclist round off two decimal places? [speed of sound =330ms^(-1) ]

The frequency of the whistle of a train is observed to drop from 280 Hz to 260 Hz as the train moves away from a stationary listerner on the platform. Calculate the speed of the train, if speed of sound in air is 340 m/s.

An engine blowing a whistle of frequency 133 Hz moves with a velocity of 60(m)/(s) towards a wall 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) .)

An engine blowing a whistle of frequency 133 Hz moves with a velocity of 60(m)/(s) towards a hill 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 train moving at a speed of 220ms^-1 towards a stationary object emits a sound of frequency 1000 Hz. Some of the sound reaching the object gets reflected back to the train as echo. The frequency of the echo as detected by the driver of the train is (speed of sound in air is 330ms^(-1) )

A train moving at a speed of 220ms^-1 towards a stationary object emits a sound of frequency 1000 Hz. Some of the sound reaching the object gets reflected back to the train as echo. The frequency of the echo as detected by the driver of the train is (speed of sound in air is 330ms^(-1) )

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)

CENGAGE PHYSICS ENGLISH-SOUND WAVES AND DOPPLER EFFECT-Single Correct
  1. A siren placed at a railway platfrom is emitted sound of frequency 5 k...

    Text Solution

    |

  2. A person speaking normally produces a sound intensity of 40 dB at a di...

    Text Solution

    |

  3. A police car moving at 22(m)/(s) chases a motorcyclist. The police man...

    Text Solution

    |

  4. In sport meet the timing of a 200 m straight dash is recorded at the f...

    Text Solution

    |

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

    Text Solution

    |

  6. Length of a string of density rho and Young's modulus Y under tension ...

    Text Solution

    |

  7. Source and observer start moving simulatneously along x and y-axis res...

    Text Solution

    |

  8. A statinary observer receives a sound of frequency 2000 Hz. The variat...

    Text Solution

    |

  9. A source of sound of frequency f1 is placed on the ground. A detector ...

    Text Solution

    |

  10. A sound wave of frequency f travels horizontally to the right . It is ...

    Text Solution

    |

  11. A man is watching two trains, one leaving and the other coming in with...

    Text Solution

    |

  12. The intensity of a sound wave gets reduced by 20% on passing through a...

    Text Solution

    |

  13. Two factories are sounding their sirens at 800 Hz. A man goes from one...

    Text Solution

    |

  14. Two sources A and B are sounding notes of frequency 680 Hz. A listener...

    Text Solution

    |

  15. A train has just completed a U-curve in a trach which is a semi circle...

    Text Solution

    |

  16. One train is approaching an observer at rest and another train is rece...

    Text Solution

    |

  17. Two sound sources are moving in opposite directions with velocities v...

    Text Solution

    |

  18. the frequency changes by 10 % as the source approaches a stationary ob...

    Text Solution

    |

  19. speed of sound wave is v. if a reflector moves toward a stationary so...

    Text Solution

    |

  20. An observer moves towards a stationary source of sound with a speed ((...

    Text Solution

    |