Home
Class 11
PHYSICS
A person standing on a road sends a soun...

A person standing on a road sends a sound signal to the driver of a car going away from him at a speed of `72 km h^-1`. The signal travelling at `330 m s^-1` in air and having a frequency of 1600 Hz gets reflected from the body of the car and returns. Find the frequency of the reflected signal as heard by the person.

Text Solution

Verified by Experts

The correct Answer is:
A, D
a. Required frequency
`n(v+v_0)/(v-v_s)xxn_0`
`(330+0)/(330-(10/3))xx1600=1616Hz`
b. Required frequency
n=(v+v_0)/(v+v_s)xxn_0`
`=(330+(10/3))/(330+20)xx1600=1417Hz`
Promotional Banner

Topper's Solved these Questions

  • SOME MECHANICAL PROPERTIES OF MATTER

    HC VERMA ENGLISH|Exercise Objective-2|7 Videos

  • SPECIFIC HEAT CAPACITIES OF GASES

    HC VERMA ENGLISH|Exercise All Questions|75 Videos

Similar Questions

Explore conceptually related problems

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

A person going away from a factory on his scooter at a speedof 36 kmh^-1 listens to the siren of the factory. If the main frequency of the siren is 600 hz and a wind is blowing alongthe direction of the scooter at 36 kmh^-1 , find the main frequency as heard by the person.

A car travels at a speed of 'a' towards a high wall. The driver sounds a horn of frequency 'n'. If V is the velocity of sound in air, frequency of reflected sound heard by the driver is

A train approaching a railway platform with a speed of 20 m s^(-1) starts blowing the whistle. Speed of sound in air is 340 m s^(-1) . If the frequency of the emitted sound from the whistle is 640 Hz, the frequency of sound as heard by person standing on the platform

A car moving at a speed of 72km/hr sounds its whistle which has a frequency of 550Hz, Find the frequencies heard by a stationary observer as the car approaches and then recedes from the observer, velocity of sound =340m/s.

There is a source of sound (a tuning fork) moving towards a reflecting wall will a speed of 30 ms^(-1) . The velocity of the sound in air is 330 ms^(-1) and the frequency of the tuning fork is 600 Hz. The observer is between the source and the wall and is moving with some velocity V_(1) towards the wall. The beat frequency heard by the observer is 4 Hz. If the tuning fork is waxed, the frequency beats heard by the observer becomes 3 Hz. If the new frequency of tuning fork is k then k//50 is

The driver of as car approaching a vertical wall notices that the frequency of his car's horn charges from 440 Hz to 480 Hz when it gets reflected from the wal. Find the speed of the car if that of the sound is 330 ms^-1 .

A van is moving with a speed of 3ms^(-1) towards a large wall. A person standing on the line of motion of the van observes the van to be moving away from him. The horm of the van is now blown. The frequency of the sound produced by the horn is 600 Hz. what is (i) The frequency of sound heard by the person for the sound produced directly by the horn? (ii) The freuquency of sound reflected by the wall. (iii) The baat frequency heard by the driver. the speed of sound in air is 330ms^(-1)?

A car moving with a speed of 30 ms^(-1) is approaching a factory whistle having the frequency 700 Hz. Calculate the apparent pitch of the whistle as heard by the driver of the car ? (Velocity of sound = 350m/s)

Two cars moving in opposite direction 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]

HC VERMA ENGLISH-SOUND WAVES-All Questions
  1. A violin player riding on a slow train plays a 440 Hz note. Another vi...

    Text Solution

    |

  2. Two identical tuning forks vibrating at the same frequency 256 Hz are ...

    Text Solution

    |

  3. A small source of sound vibrating at frequency 500 Hz is rotated in a ...

    Text Solution

    |

  4. Two trains are travelling towards each other both at a speed of 90 km ...

    Text Solution

    |

  5. A traffic policeman sounds a whistle to stop a car-driver approaching ...

    Text Solution

    |

  6. A car moving at 108 km h^-1 finds another car in front of it going in ...

    Text Solution

    |

  7. Two submarines are approaching each other in a calm sea. The first sub...

    Text Solution

    |

  8. A small source of sound oscillates in simple harmonic motion with an a...

    Text Solution

    |

  9. A boy riding on his bike is going towards east at a speed of 4sqrt2ms^...

    Text Solution

    |

  10. A sound source, fixed at the origin, is continuously emitting sound at...

    Text Solution

    |

  11. A train running at 108 km h^-1 towards east whistles at a dominant fre...

    Text Solution

    |

  12. A boy riding on a bicycle going at 12 km h^-1 towards a vertical wall ...

    Text Solution

    |

  13. A person standing on a road sends a sound signal to the driver of a ca...

    Text Solution

    |

  14. A car moves with a speed of 54 kmh^-1 towards a cliff. The horn of the...

    Text Solution

    |

  15. An operator sitting in his base camp sends a sound signal of frequency...

    Text Solution

    |

  16. Figure shows a source of sound moving along the X-axis at a speed of 2...

    Text Solution

    |

  17. A source emitting sound at frequency 4000 Hz, is moving along the Y-ax...

    Text Solution

    |

  18. A source of sound emitting a 1200 Hz note travels along a straight lin...

    Text Solution

    |

  19. A small source of sound S of frequency 500 Hz is attached to the end o...

    Text Solution

    |

  20. A source emitting a sound of frequency v is placed at a large distance...

    Text Solution

    |