Home
Class 11
PHYSICS
A point source emits sound equally in al...

A point source emits sound equally in all direction is a non-absorbing medium. Two points p and Q are at distances of 2m and 3m, respectively, from the source. The ratio of the intensities of the waves at P and Q is

A

`3 :2`

B

`4 : 9`

C

`2 : 3`

D

`9 : 4`

Text Solution

Verified by Experts

The correct Answer is:
D
`I prop (1)/(r^(2)) implies (I_(P))/(I_(Q)) = ((r_(Q))/(r_(P)))^(2) = ((3)/(2))^(2) = (9)/(4)`
Promotional Banner

Topper's Solved these Questions

  • WAVES

    FULL MARKS|Exercise Additional Questions Solved (2- Mark Questions )|10 Videos

  • WAVES

    FULL MARKS|Exercise Additional Questions Solved (Numerical Problems )|10 Videos

  • WAVES

    FULL MARKS|Exercise Textual Evaluation Solved (Conceptual Questions )|6 Videos

  • SOLVED PAPER 17 (UNSOLVED)

    FULL MARKS|Exercise Part-IV|10 Videos

  • WORK, ENERGY AND POWER

    FULL MARKS|Exercise Additional Question Solved (Numercials)|11 Videos

Similar Questions

Explore conceptually related problems

Co-ordinates of points P and Q are -2 and 2 respectively. Find d(P,Q).

A point source emitting uniformly in all directions is placed above a table top at a distance of 0.50 m from it. The luminous flux of the source is 500 lumen. Find the illuminance at a small surface area of the table to a.directly below the source and b. at as distance of 0.80 m from the source.

Two point charges +q and -q are placed at points A and B respectively separated by a samll distance. The electric field intensity at the midpoint O of AB :

The distance of two points P and Q on the parabola y^(2) = 4ax from the focus S are 3 and 12 respectively. The distance of the point of intersection of the tangents at P and Q from the focus S is

A point source of light is placed at a distance of 2f from a converging lens of focal length f. The intensity on the other side of the lens is maximum at a distance

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 ?

Find the unit vector in the direction of vector vec(PQ) , where P and Q are the points (1, 2, 3) and (4, 5, 6) respectively.

A point source emitting light uniformly in all directions is placed 60 cm above a table-top. The illuminance at a point on the table-top, directly below the source, is 15 lux. Find the illuminance at a point on the table-top 80 cm away from the first point.

A converging mirror M_1 a point source S and a diverging mirror M_2 are arranged as shown in figure. The source is placed at a distance of 30 cm from M_1 . The focal length of each of the mirrors is 20 cm. Consider only the images formed by a maximum of two reflections. It is found that one image is formed on the source itself. (a) Find the distance between the two mirrors. (b) Find the location of the image formed by the single reflection from M_2

FULL MARKS-WAVES -Additional Questions Solved
  1. A transvrs wave propagating along x-axis is represented by y(x,t) =8...

    Text Solution

    |

  2. Two waves represented by the following equation are travelling in the ...

    Text Solution

    |

  3. A point source emits sound equally in all direction is a non-absorbing...

    Text Solution

    |

  4. The waves produced by a motor boat sailing in water are …………. .

    Text Solution

    |

  5. Doppler effect in sound is due to ……………

    Text Solution

    |

  6. The velocity of sound in air at a particular temperature is 330ms^(-1)...

    Text Solution

    |

  7. Sound waves travel at 350 m/s through warm air and at 3500 m/s through...

    Text Solution

    |

  8. A train moving at a speed of 220 m/s towards a stationary object , emi...

    Text Solution

    |

  9. A sound of frequency 1500 Hz is emitted by a source which moves away f...

    Text Solution

    |

  10. Beats occur because of

    Text Solution

    |

  11. A vibrating stretched string resonates with a tuning fork of frequency...

    Text Solution

    |

  12. A cylindrical tube, open at both ends has a fundamental frequency f in...

    Text Solution

    |

  13. With the increase in temperature , the frequency of the found from an ...

    Text Solution

    |

  14. Two waves of the same frequency and amplitude super impose to produce ...

    Text Solution

    |

  15. A sonometer wire is vibrating in the second overtone. In the wire ther...

    Text Solution

    |

  16. If a resonance tube is sounded with a tuning fork of frequency 256 Hz,...

    Text Solution

    |

  17. A wave of frequency 100 Hz s sent along a string towards a fixed unit....

    Text Solution

    |

  18. A standing wave is represented by y=A sin (100t) cos (0.01x) where y a...

    Text Solution

    |

  19. Two waves of the same frequency and intensity superimpose with each ot...

    Text Solution

    |

  20. Two open organ pipes of lengths 50 cm and 50.5 cm produce 3 beats/s. T...

    Text Solution

    |