Home
Class 12
PHYSICS
Intensity level at a distance 200 cm fro...

Intensity level at a distance 200 cm frorn.a point source of sound is 80 dB. If there is it loss of acoustic power in air and intensity of tireshold hearing is `10^-12` W`m^-2`, then the intensity level at a distance of 4000 pm from source is (log 20` = 1.3)

A

44 dB

B

54 dB

C

64 dB

D

Zero

Text Solution

AI Generated Solution

Promotional Banner

Topper's Solved these Questions

  • TEST 3

    AAKASH INSTITUTE ENGLISH|Exercise EXAMPLE|74 Videos

  • TEST 5

    AAKASH INSTITUTE ENGLISH|Exercise EXAMPLE|43 Videos

Similar Questions

Explore conceptually related problems

The intensity of sound from a radio at a distance of 2 metres from its speaker is 1xx10^(-2) mu W//m^(2) . The intensity at a distance of 10 meters would be

The sound intensity is 0.008W//m^( 2) at a distance of 10 m from an isotropic point source of sound. The power of the source is

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 ?

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 sound level at a distance of 3.00 m from a source is 120 dB. At what distance will the sound level be (a) 100 dB and (b) 10.0 dB?

The sound level at a distance of 3.00 m from a source is 120 dB. At what distance will the sound level be (a) 100 dB and (b) 10.0 dB?

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 ?

A point A is located at a distance r = 1.5 m from a point source of sound of frequency 600 H_(Z) . The power of the source is 0.8 W . Speed of sound in air is 340 m//s and density of air is 1.29 kg//m^(3) . Find at the point A , (a) the pressure oscillation amplitude (Deltap)_(m) (b) the displacement oscillation amplitude A .

Intensity level at a point is 100 dB. How much is the actual intensity of sound falling at that point ? Given threshold intensity of sound is 10^(-12) "Wm"^(-2) .

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.

AAKASH INSTITUTE ENGLISH-TEST 4-EXAMPLE
  1. A person feels 2.5% difference of frequency of a motor-car horn. If th...

    Text Solution

    |

  2. If the amplitude of sound is doubled and the frequency reduced to one-...

    Text Solution

    |

  3. Intensity level at a distance 200 cm frorn.a point source of sound is ...

    Text Solution

    |

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

    Text Solution

    |

  5. In an experiment, sonometer wire vibrates in 4 loops when a 50 g weigh...

    Text Solution

    |

  6. Given figure shows an incident pulse P reflected from a rigid support....

    Text Solution

    |

  7. Two tuning forks P and Q are vibrated together. The number of beats pr...

    Text Solution

    |

  8. A string is rigidly tied at two ends and its equation of vibration is ...

    Text Solution

    |

  9. The length of a sonometer wire is 0.75 m and density is 9 xx 10^3 kg/m...

    Text Solution

    |

  10. Three waves of equal frequency having amplitudes 10 mm, 4 mm and 7 mm ...

    Text Solution

    |

  11. A line source of sound of length 10 m, emitting a pulse of sound that ...

    Text Solution

    |

  12. The particles of a medium oscillate about their equilibrium position, ...

    Text Solution

    |

  13. The change in frequency due to Doppler effect does not depend on

    Text Solution

    |

  14. The dimensional formula of "Moment of force" is

    Text Solution

    |

  15. The direction of the angular velocity vector is along

    Text Solution

    |

  16. The rotational inertia of a disc about its geometrical axis does not d...

    Text Solution

    |

  17. A force with a given magnitude is to be applied to a wheel. The torque...

    Text Solution

    |

  18. A particle, held by a string whose other end is attached to a fixed po...

    Text Solution

    |

  19. A single force acts on a particle situated on the negative x-axis. The...

    Text Solution

    |

  20. Ten seconds after an electric fan is turned on, the fan rotates at 300...

    Text Solution

    |