Home
Class 11
PHYSICS
A source of sound emits 200piW power whi...

A source of sound emits 200`piW` power which is uniformly distributed over a sphere of radius 10 m. What is the loudness of sound on the surface of the sphere?

A

70 dB

B

107 dB

C

80 dB

D

117 dB

Text Solution

Verified by Experts

The correct Answer is:
D
Intensity,
`I=(P)/(A)=(200pi)/(4pixx(10)^2)=0.5(W)/(m^2)`
No. of decibels is given by
`10log_(10)=(I)/(I_0)=10log_(10)((0.5)/(10^-12))`
`=10log_(10)(5xx10^11)`
`10log_(10)((10^12)/(2))`
`=117dB`
Promotional Banner

Topper's Solved these Questions

  • SOUND WAVES AND DOPPLER EFFECT

    CENGAGE PHYSICS ENGLISH|Exercise Multiple Correct|44 Videos

  • SOUND WAVES AND DOPPLER EFFECT

    CENGAGE PHYSICS ENGLISH|Exercise Assertion-Reasoning|24 Videos

  • SOUND WAVES AND DOPPLER EFFECT

    CENGAGE PHYSICS ENGLISH|Exercise Subjective|56 Videos

  • RIGID BODY DYNAMICS 2

    CENGAGE PHYSICS ENGLISH|Exercise Interger|2 Videos

  • SUPERPOSITION AND STANDING WAVES

    CENGAGE PHYSICS ENGLISH|Exercise Comprehension Type|5 Videos

Similar Questions

Explore conceptually related problems

A dog while barking delivers about 1 mW of power. If this power is uniformly distributed over a hemispherical area, what is the sound level at a distance of 5 m? What would the sound level be if instead of 1 dog, 5 dogs start barking at the same time each delivering 1 mW of power

A ring of radius 'R' having change 'q' uniformly distributed over it passes through a sphere lies at circumference of ring the centre of ring lies at surface of sphere.Then flux linked with sphere is

A solid sphere of radius R has a spherical cavity of radius r as shown in the figure. If the volume charge density sigma is uniformly distributed over the whole volume of the sphere, then electric field strength at the centre of the sphere will be

What is the level of loudness of a sound of intensity 10^(-12) W//m^2 ?

Surface charge density of a sphere of a radius 10 cm is 8.85 xx 10^(-8)c//m^(2) . Potential at the centre of the sphere is

A charge q is distributed uniformly on the surface of a sold sphere of radius R. It covered by a concentric hollow conduction sphere of radius 2R . Find the charges inner and outer surface of hollow sphere if it is earthed.

A non-conducting sphere of radius R is given a charge Q. Charge is uniformly distributed in its volume. The electric potential at centre and at the surface of sphere respectively are

A charger Q is distributed uniformly on a ring of radius of r. A sphere of equal radius r is constructed with its centre a t the periphery of the ring. The flux of the electric field through the surface of the sphere is (Q)/(n epsilon_(0)) , The value of n is

A Charge Q is distributed uniformly on a ring of radius r. A sphere of equal r is constructed with its centre at the periphery of the ring (figure 30.12) Find the flux of the electric field through the surface of the sphere.

A charge Q is uniformly distributed over the surface of two conducting concentric spheres of radii R and r (Rgtr). Then, potential at common centre of these spheres is

CENGAGE PHYSICS ENGLISH-SOUND WAVES AND DOPPLER EFFECT-Single Correct
  1. A source of sound S is travelling at (100)/(3)(m)/(s) along a road, to...

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

  8. A source emitting a sound of frequency f is placed at a large distance...

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

  12. When a person wears a hearing aid, the sound intensity level increases...

    Text Solution

    |

  13. A motorcycle starts from rest and accelerates along a straight line at...

    Text Solution

    |

  14. The difference in the speeds of sound in air at -5^@C, 60 cm pressure ...

    Text Solution

    |

  15. A train is moving in an elliptical orbit in anticlockwise sense with a...

    Text Solution

    |

  16. A statinary observer receives a sound of frequency 2000 Hz. The variat...

    Text Solution

    |

  17. The sound from a very high burst of fireworks takes 5 s to arrive at t...

    Text Solution

    |

  18. A car emitting sound of frequency 500 Hz speeds towards a fixed wall a...

    Text Solution

    |

  19. In the figure shown, a source of sound of frequency 510 Hz moves with ...

    Text Solution

    |

  20. A wall is moving with velocity u and a source of sound moves with velo...

    Text Solution

    |