Home
Class 11
PHYSICS
A source of sound S and a detector D are...

A source of sound S and a detector D are placed at some distance from one another. A big cardboard is placed near the detector and perpendicular to the line SD as shown in figure. It is gradually moved away and it is found that the intensity changes from a maximum to a minimum as the board is moved through a distance of 20 cm. Find the frequency of the sound emitted. Velocity of sound in air is `336 m s^-1`.

Text Solution

Verified by Experts

The correct Answer is:
B, D
According to the given data, `V=336 m/s`
`lamda/4=` distance between maximum and minimum intensilty `=20cm`
`rarr lamda=80 cm`
`rarr n=frequency =V/lamda`
`=336/)80x10^-2)=420Hz`
Promotional Banner

Topper's Solved these Questions

  • SOME MECHANICAL PROPERTIES OF MATTER

    HC VERMA|Exercise Exercises|32 Videos

  • SPECIFIC HEAT CAPACITIES OF GASES

    HC VERMA|Exercise All Questions|74 Videos

Similar Questions

Explore conceptually related problems

In Quincke's experiment the sound detected is changed from a maximum to a minimum when the sliding tube is moved through a distance of 2.50 cm. Find the frequency of sound if the speed of sound in air is 340 m s^-1 .

A source S and a detector D are placed at a distance d apart. A big cardboard is placed at a distance sqrt2d from the source and the detector as shown in figure. The source emits a wave of wavelength = d/2 which is received by the detector after reflection from the cardboard. It is found to be in phase with the direct wave received from the source. By what minimum distance should the cardboard be shifted away so that the reflected wave becomes out of phase with the direct wave ?

Two particles A and B having equal charges are placed at distance d apart. A third charged particle placed on the perpendicular bisector at a distance x will experience the maximum Coulomb’s force when :

An object is placed at a distance 20 cm from a convex lens of focal length 10 cm . Find the image distance and nature of the image .

An object is placed at a distance of 10 cm from a convex lens of focal length 12 cm. Find the position and nature of the image.

A source of sound emitting a 1200 Hz note travels along a straight line at a speed of 170 m s^-1 . A detector is placed at a distance of 200 m from the line of motion of the source. (a) Find the frequency of sound received by the detector at the instant when the source gets closest to it. (b) Find the distance between the source and the detector at the instant it detects the frequency 1200 Hz. Velocity of sound in air = 340 m s^-1 .

A concave mirror having a radius of curvature 40 cm is placed in front of an illuminated point source at a distance of 30 cm from it. Find the location of the image.

HC VERMA-SOUND WAVES-All Questions
  1. In Quincke's experiment, the sound intensity has a minimum value I at ...

    Text Solution

    |

  2. Two audio speakers are kept some distance apart and are driven by the ...

    Text Solution

    |

  3. A source of sound S and a detector D are placed at some distance from ...

    Text Solution

    |

  4. A source S and a detector D are placed at a distance d apart. A big ca...

    Text Solution

    |

  5. Two stereo speakers are separated by a distance of 2.40 m. A person st...

    Text Solution

    |

  6. Two speakers S(1) and S(2) derived by the same amplifier and placed at...

    Text Solution

    |

  7. Three sources of sound S1, S2 and S3 of equal intensity are placed in ...

    Text Solution

    |

  8. Two coherent narrow slits emitting sound of wavelength lambda in the s...

    Text Solution

    |

  9. Figure shows two coherent sources S1 and S2which emit sound of wavelen...

    Text Solution

    |

  10. Find the fundamental, first overtone and second overtone frequencies o...

    Text Solution

    |

  11. A closed organ pipe can vibrate at a minimum frequency of 500 Hz. Find...

    Text Solution

    |

  12. In a standing wave pattern in a vibrating air column, nodes are formed...

    Text Solution

    |

  13. The separation between a node and the next antinode in a vibrating air...

    Text Solution

    |

  14. A cylindrical metal tube has a length of 50 cm and is open at both end...

    Text Solution

    |

  15. In a resonance column experiment, a tuning fork of frequency 400 Hz is...

    Text Solution

    |

  16. The first overtone frequency of a closed organ pipe P1 is equal to the...

    Text Solution

    |

  17. A copper rod of length 1.0 m is clamped at its middle point. Find the ...

    Text Solution

    |

  18. Find the greatest length of an organ pipe open at both ends that will ...

    Text Solution

    |

  19. An open organ pipe has a length of 5 cm. (a) Find the fundamental freq...

    Text Solution

    |

  20. An electronically driven loudspeaker is placed near the open end of a ...

    Text Solution

    |