Home
Class 11
PHYSICS
An observer moves towards a stationary s...

An observer moves towards a stationary source of sound with a velocity one-fifth of the velocity of sound. What is the percentage increase in the apparent frequency?

A

`5%`

B

`20%`

C

`0%`

D

`0.5%`

Text Solution

Verified by Experts

The correct Answer is:
B
`f=f_0((v_S+v_0)/(v_S))`
`=f_0[(v+(v)/(5))/(v)]`
`=(6)/(5)f_0`
Hence, percentage increase is
`[((6)/(5)f_0-f_0)/(f_0)]xx100=20%`
Promotional Banner

Topper's Solved these Questions

  • SOUND WAVES AND DOPPLER EFFECT

    CENGAGE PHYSICS|Exercise Multiple Correct|44 Videos

  • SOUND WAVES AND DOPPLER EFFECT

    CENGAGE PHYSICS|Exercise Assertion-Reasoning|24 Videos

  • SOUND WAVES AND DOPPLER EFFECT

    CENGAGE PHYSICS|Exercise Subjective|56 Videos

  • RIGID BODY DYNAMICS 2

    CENGAGE PHYSICS|Exercise Interger|2 Videos

  • SUPERPOSITION AND STANDING WAVES

    CENGAGE PHYSICS|Exercise Comprehension Type|5 Videos

Similar Questions

Explore conceptually related problems

An observer is moving towards the stationary source of sound, then

If an observer moves towards a stationary source of sound with a velocity of one tenth the velocity of sound, then the apparent increase in frequency will be

When an observer moves away from a stationary source of sound, the apparent pitch will

An observer is approaching a stationary source with a velocity 1/4 th of the velocity of sound. Then the ratio of the apparent frequency to actual frequency of source is

A source of sound crosses a stationary observer which is moving with uniform velocity v. If the velocity of sound in air is V, then the ratio of the apparent frequencies heard by the observer before and after the source crosses him would be -

An observer moves towards a stationary source of sound with a speed ((1)/(5)) th of the speed of sound. The wavelength and frequency of the source emitted are lamda and f, respectively. The apparent frequency and wavelength recorded by the observer are, respectively.

CENGAGE PHYSICS-SOUND WAVES AND DOPPLER EFFECT-Single Correct
  1. An isotropic stationary source is emitting waves of frequency n and wi...

    Text Solution

    |

  2. A train is moving with a constant speed along a circular track. The en...

    Text Solution

    |

  3. An observer moves towards a stationary source of sound with a velocity...

    Text Solution

    |

  4. An increase in intensity level of 1 dB implies an increase in density ...

    Text Solution

    |

  5. In expressing sound intensity we take 10^(-12)(W)/(m^2) as the referen...

    Text Solution

    |

  6. The intensity level of two sounds are 100 dB and 50 dB. What is the ra...

    Text Solution

    |

  7. An engine running at speed (v)/(10) sounds a whistle of frequency 600 ...

    Text Solution

    |

  8. A source of sound produces waves of wavelength 60 cm when it is statio...

    Text Solution

    |

  9. The apparent frequency of the whistle of an engine changes in the rati...

    Text Solution

    |

  10. A source of sound S is travelling at (100)/(3)(m)/(s) along a road, to...

    Text Solution

    |

  11. A source of sound is travelling with a velocity of 30(m)/(s) towards a...

    Text Solution

    |

  12. A source of sound emits 200piW power which is uniformly distributed ov...

    Text Solution

    |

  13. Two cars are moving on two perpendicular roads towards a crossing with...

    Text Solution

    |

  14. A tuning fork of frequency 380 Hz is moving towards a wall with a velo...

    Text Solution

    |

  15. A sound wave of frequency n travels horizontally to the right with spe...

    Text Solution

    |

  16. A boy is walking away from a well at a speed of 1.0 m//s in a directio...

    Text Solution

    |

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

    Text Solution

    |

  18. Due to a point isotropic sonic source, loudness at a point is L=60dB I...

    Text Solution

    |

  19. The frequency of a car horm is 400 Hz. If the horn is honked as the ca...

    Text Solution

    |

  20. Spherical sound waves are emitted uniformly in all direction from a po...

    Text Solution

    |