Home
Class 11
PHYSICS
Loudness of sound from an isotropic poin...

Loudness of sound from an isotropic point source at a distace of `70cm` is `20dB`. What is the distance (in m) at which it is not heard.

Text Solution

Verified by Experts

The correct Answer is:
2
Promotional Banner

Topper's Solved these Questions

  • SOUND WAVES

    RESONANCE ENGLISH|Exercise Exercise- 2 PART - III|19 Videos

  • SOUND WAVES

    RESONANCE ENGLISH|Exercise Exercise- 2 PART - IV|8 Videos

  • SOUND WAVES

    RESONANCE ENGLISH|Exercise Exercise- 2 PART - I|24 Videos

  • SIMPLE HARMONIC MOTION

    RESONANCE ENGLISH|Exercise Exercise|28 Videos

  • STRING WAVES

    RESONANCE ENGLISH|Exercise Exercise|32 Videos

Similar Questions

Explore conceptually related problems

Loudness of sound from on isotopic point source at distance of 10 m is 20 dB. Find the loudness (in dB) at a point at a distance 10^(7//4) m from the source.

The intensity of sound from a point source is 1.0 xx 10^-8 Wm^-2 , at a distance of 5.0 m from the source. What will be the intensity at a distance of 25 m from the source ?

The intensity of sound from a public loud speaker is 1mu "watt m"^(-2) at a distance of 5 m. What is the intensity at a distance of 100 m ?

The intensity of a wave emitted from a small source at a distance 10 m is 20 xx 10^(-3)"Wm"^(-2). What is the intensity at a distance 100 m ?

A source of sound operates at 2.0 kHz, 20 W emitting sound uniformly in all direction. The speed of sound in air is 340 m s^(-1) at a distance of air is 1.2kgm ^(-3) (a) What is the intensity at a distance of 6.0 m from the source ? (b) What will be the pressure amplitude at this point ? (c ) What will be the displacement amplitude at this point ?

A photographic plate placed at a distance of 5 cm from a weak point source is exposed for 3 s. If the plate is kept at a distance of 10 cm from the source, the time needed for the same exposure is

A person speaking normally produces a sound intensity of 40dB at a distance of 1m. If the threshold intensity for reasonable audibility is 20dB, the maximum distance at which a person can be heard clearly is (2x) meter . Find the value of x.

The intensity of a point source emitting sound at distance 3 from the source is 0.707 W//m^2? What is the average power output of the source ?

The focal length of a convex mirror is 40 cm. A point source of light is kept at distance 40 cm from the mirror. Find the distance of image from the mirror.

At a distance 20 m from a point source of sound the loudness level is 30 dB . Neglecting the damping, find (a) the loundness at 10 m from the source (b) the distance from the source at which sound is not heard.

RESONANCE ENGLISH-SOUND WAVES-Exercise- 2 PART - II
  1. The temperature of air in a 900m long tunnel varies linearly form 100 ...

    Text Solution

    |

  2. A point sound is located in the perpendicular to the plane of a ring d...

    Text Solution

    |

  3. Two coherent sources S(f) and S(2) (in phase with ech other) are place...

    Text Solution

    |

  4. Two coherent sources are placed at the corners of a rectangular track ...

    Text Solution

    |

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

    Text Solution

    |

  6. A man standing in front of a mountain beats a drum at regular interval...

    Text Solution

    |

  7. Loudness of sound from an isotropic point source at a distace of 70cm ...

    Text Solution

    |

  8. The equation of stationary wave along a stretched string is given by y...

    Text Solution

    |

  9. A standing wave y=a sin kx cos omegat is maintained in a homogeneous r...

    Text Solution

    |

  10. The two pipes are submerged in sea water, arranged as shown in figure....

    Text Solution

    |

  11. Two narrow cylindrical pipes A and B have the same length. Pipe A is o...

    Text Solution

    |

  12. In a resonance tube experiment to determine the speed of sound in air,...

    Text Solution

    |

  13. In the experiment for the determination of the speed of sound in air u...

    Text Solution

    |

  14. When a tuning fork vibrates with 1.0 m or 1.05 m long wire of a , 5 be...

    Text Solution

    |

  15. A toy-car, blowing its horn, is moving with a steady spped of 5 m/s, a...

    Text Solution

    |

  16. S is source R us reciver. R and S are at rest. F Frequency of sound fr...

    Text Solution

    |

  17. A source S emitting sound of 300 Hz is fixed on block A which is attac...

    Text Solution

    |

  18. Two vehicles A and B are moving towards each other with same speed u =...

    Text Solution

    |

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

    Text Solution

    |

  20. A source of sonic oscillations with frequency n=1700Hz and a receiver ...

    Text Solution

    |