Home
Class 12
PHYSICS
At what speed should a source of sound m...

At what speed should a source of sound moves so that observer find that apparent frequency equal to half of the original frequecy ?

A

`(v)/(2)`

B

2v

C

`(v)/(4)`

D

v

Text Solution

Verified by Experts

The correct Answer is:
D
`v. = ((V)/(V + U_(s)) ) v rArr 2V = (V + U_(s))`
`U_(s) ` = V
Hence the correct choice is (d) .
Promotional Banner

Topper's Solved these Questions

  • WAVE MOTION

    MODERN PUBLICATION|Exercise MULTIPLE CHOICE QUESTIONS (LEVEL -II)|73 Videos

  • WAVE MOTION

    MODERN PUBLICATION|Exercise MULTIPLE CHOICE QUESTIONS (LEVEL -III)|8 Videos

  • UNITS, MEASURMENTS, DIMENSIONS, ERRORS OF MEASUREMENTS

    MODERN PUBLICATION|Exercise Recent Competitive Questions|7 Videos

  • WAVE OPTICS

    MODERN PUBLICATION|Exercise Recent Competitive Questions|18 Videos

Similar Questions

Explore conceptually related problems

With what velocity should an observer approach a stationary shound source so that the apparent frequency of shound should appear double the actual frequency ? (v is velocity of shound).

A source of sound moves towards a stationary listener with a velocity equal to half the velocity of sound. If the actual frequency of the sound produced by the source be cc"f" , then the change in frequency is

The difference between the apparent frequency of a source of sound as perceived by the observer during its approach and recession is 2% of the frequency of the source. If the speed of sound in air is 300 ms^(-1) , the velocity of the source is

The apparent frequency of a note is 200 Hz. When a listener is moving with a velocity of 40 ms^(-1) towards a stationary source. When he moves away from the same source with the same speed, the apparent frequency of the same note is 160 Hz. The velocity of sound in air in m//s is

A sound source is moving towards stationary listener with (1)/(10)th of the speed of sound. The ratio of apparent to real frequency is

What is Doppler effect of sound? Derive expression for apparent frequency of sound. When source is moving away from stationary listener.

When the listener moves towards a stationary source with a velocity V_(L) , the apparent frequency of a note emitted by the source is f' . When the listener moves away from the source with the same velocity, the apparent frequency of the note is f" . Given f'//f"=3 and V as the velocity of sound in air, the value of V/V_(L) is

MODERN PUBLICATION-WAVE MOTION-RECENT COMPETITIVE QUESTIONS
  1. At what speed should a source of sound moves so that observer find tha...

    Text Solution

    |

  2. A bat flies at steady speed of 4" m s"^(-1) emitting a sound of f=90xx...

    Text Solution

    |

  3. A clsoed organ pipe and an open organ pipe of same length produce 2 be...

    Text Solution

    |

  4. A uniform wire of length L, diameter D and density rho is stretched un...

    Text Solution

    |

  5. The equation of a wave is given by y=10sin((2pi)/(45)t+alpha) If ...

    Text Solution

    |

  6. Two tuning forks,A and B produce notes of frequencies 258 Hz and 262 H...

    Text Solution

    |

  7. A wire under tension vibrates with a fundamental frequency of 600 Hz.I...

    Text Solution

    |

  8. Which of the following is incorrect ?

    Text Solution

    |

  9. Intensity level of sound whose intensity is 10^(-8) W m^(-2) is ….. dB

    Text Solution

    |

  10. The equations of a transverse wave is given by y= 0.05 sin pi (2t- 0.0...

    Text Solution

    |

  11. The frequency of the second overtone of the open pipe is equal to the ...

    Text Solution

    |

  12. A person with vibrating tuning fork of frequency 338Hz is moving towar...

    Text Solution

    |

  13. A metallic wire of 1 m length has a mass of 10xx10^(-3)kg. If a tensio...

    Text Solution

    |

  14. A train is approaching towards a platform with a speed of 10 m s^(-1) ...

    Text Solution

    |

  15. A pipe of 30 cm long and open at both the ends produces harmonics. Whi...

    Text Solution

    |

  16. A streched string is vibrating in the second overtone , then the nu...

    Text Solution

    |

  17. When two tunning forks A and B are sounded together , 4 beats per se...

    Text Solution

    |

  18. If the surface is a perfect reflector. The change in momentum of the w...

    Text Solution

    |

  19. A steel wire has a lengh of 90 cm which is under a constant tension of...

    Text Solution

    |