Home
Class 12
PHYSICS
Two factories are sounding their sirens ...

Two factories are sounding their sirens at 800 Hz. A man goes from one factory to the other at a speed of 2 m/s. The velocity of sound is 320 m/s. The number of beats heard by the person is 1 s will be

A

2

B

4

C

8

D

10

Text Solution

Verified by Experts

The correct Answer is:
D
Promotional Banner

Topper's Solved these Questions

  • WAVES

    DISHA PUBLICATION|Exercise EXERCISE 1 CONCEPT BUILDER|58 Videos
  • WAVES

    DISHA PUBLICATION|Exercise EXERCISE -2 CONCEPT APPLICATOR|30 Videos
  • WAVE OPTICS

    DISHA PUBLICATION|Exercise EXERCISE-2 : CONCEPT APPLICATOR|30 Videos

Similar Questions

Explore conceptually related problems

A whistle emitting a sound of frequency 450 Hz approaches a stationary observer at a speed of 33 m/s. Velocity of sound is 330 m/s. The frequency heard by the observer, in Hz, is :

The wavelength of a particle is 99 cm and that of other is 100 cm. Speed of sound is 396 m/s. The number of beats heard is

A source of sound S of frequency 500 Hz situated between a stationary observer O and wall W , moves towards the wall with a speed of 2m//s . If the velocity of sound is 332m//s . Then the number of beats per second heard by the observer is (approximately)

A car, sounding a horn of frequency 1000 Hz, is moving directly towards a huge wall at a speed of 15 m/s. If speed of sound is 340 m/s, then the frequency of the echo heard by the driver is

Two sirens situated one kilometer apart are producing sound of frequency 330 Hz. An observer starts moving from one siren to the other with a speed of 2m//s . If the speed of sound be 330 m//s , what will be the beat frequency heard by the observer?

When the wavelength of sound changes from 1 m to 1.01 m, the number of beats heard per second are 4. The velocity of sound is

DISHA PUBLICATION-WAVES-EXERCISE -2 CONCEPT APPLICATOR
  1. Two factories are sounding their sirens at 800 Hz. A man goes from one...

    Text Solution

    |

  2. When two sound waves travel in the same direction in a medium, the dis...

    Text Solution

    |

  3. A progressive sound wave of frequency 500 Hz is travelling through air...

    Text Solution

    |

  4. A tuning fork arrangement (pair) produces 4 beats//sec with one fork o...

    Text Solution

    |

  5. The displacement of a wave disturbance propagating in the positive x-d...

    Text Solution

    |

  6. A and B are two sources generating sound waves. A listener is situated...

    Text Solution

    |

  7. A whistle S of frequency f revolves in a circle of radius R at a const...

    Text Solution

    |

  8. A sonometer wire of length 114 cm is fixed at both the ends. Where sho...

    Text Solution

    |

  9. While measuring the speed of sound by performing a resonance column ex...

    Text Solution

    |

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

    Text Solution

    |

  11. A sonometer wire resonates with a given tuning fork forming a standing...

    Text Solution

    |

  12. In a transverse wave the distance between a crest and neighbouring tro...

    Text Solution

    |

  13. An engine approaches a hill with a constant speed. When it is at a dis...

    Text Solution

    |

  14. A transverse sinusoidal wave moves along a string in the positive x-di...

    Text Solution

    |

  15. The frequency of a stretched uniform wire under tension is in resonanc...

    Text Solution

    |

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

    Text Solution

    |

  17. An organ pipe, open from both end produces 5 beats per second when vib...

    Text Solution

    |

  18. An earthquake generates both transverse (S) and longitudinal (P) sound...

    Text Solution

    |

  19. An isotrophic point source S of sound emits constant power, Two points...

    Text Solution

    |

  20. A column of air and a tuning fork produce 4 beats per second when soun...

    Text Solution

    |

  21. The temperature of a mono-atomic gas in an uniform container of length...

    Text Solution

    |