Home
Class 11
PHYSICS
A pipe of length 85cm is closed from one...

A pipe of length `85cm` is closed from one end. Find the number of possible natural oscillations of air column in the pipe whose frequencies lie below `1250 Hz`. The velocity of sound in air is `34m//s`.

A

6

B

4

C

12

D

8

Text Solution

Verified by Experts

The correct Answer is:
A
Fundamental frequency of closed organ pipe
`f_(0)=(v)/(4l)=(340)/(4xx0.85)=100Hz`
So possible frequencies below 1250 Hz are
`100 Hz,300 Hz,500 Hz,700 Hz,900 Hz,1100 Hz`
`rArr` No. of frequencies = 6.
Promotional Banner

Topper's Solved these Questions

  • WAVES AND OSCILLATIONS

    ALLEN |Exercise Part-1(Exercise-05)[B]|42 Videos

  • WAVES AND OSCILLATIONS

    ALLEN |Exercise Part-1(Exercise-04)[B]|13 Videos

  • SEMICONDUCTORS

    ALLEN |Exercise Part-3(Exercise-4)|50 Videos

Similar Questions

Explore conceptually related problems

One end of 85 cm long pipe is made closed. Now, normal modes of vibration are set up in the air column, inside this pipe. Find no. of harmonics having frequency less than 1250 Hz. (Velocity of sound in air is 340 m/s.)

A narrow pipe of length 2m is closed at one end. The velocity of sound in air is 320 m/s. Neglecting end corrections , the air column in the pipe will resonate for sound of frequencies :

A stationary observer receives sound from two identical tuning forks, one of which approaches and the other one receded with the same speed (much less than the speed of sound). The observer hears 2 beats/sec. The oscillation frequency of each tuning fork is v_(0)= 1400Hz and the velocity of sound in air is 350m/s. The speed of each tuning fork is close to

A pipe 20 cm long is closed at one end. Which harmonic mode of the pipe is resonantly excited by a 430 Hz source ? Will the same source be in resonane with the pipe if both end are open ? (speed of sound in air is 340 m s^(-1)) .

A tuning fork is used to produce resonance in a glass tube. The length of the air column in this tube can be adjusted by a variable piston. At room temperature of 27 ^(@)C two successive resonance are produced at 20 cm and 73 cm of column length. If the frequency of the tuning fork is 320 Hz, the velocity of sound in air at 27^(@) C is

Two tuning forks A and B lying on opposite sides of observer 'O' and of natural frequency 80 Hz move with velocity 10 m//s relative to stationary observer O . Fork A moves away from the observer while the fork B moves towards him. A wind with a speed 10 m//s is blowing in the direction of motion of fork A . Find the beat frequency measured by the observer in Hz. [Take speed of sound in air as 340 m//s ].

A cylinder ABC consists of two chambers 1 and 2 which contains two different gases. The wall C is rigid but the walls A and B are thin diaphragms. A vibrating tuning fork approaches the wall A with velocity u = 30 m//s and air column in chamber 1 and 2 vibrates with minimum frequency such that there is node (displacement) at B and antinode (displacement) at A. Find : (i) the fundamental frequency of air column (ii) find the frequency of tuning fork. Assume velocity of sound in the first and second chamber be 1100 m/s and 300 m/s respectively. .

ALLEN -WAVES AND OSCILLATIONS-Part-1(Exercise-05)[A]
  1. A whistle producing sound waves of frequencies 9500 Hz and above is ap...

    Text Solution

    |

  2. A sound absorber attenuates the sound level by 20 dB. The intensity de...

    Text Solution

    |

  3. While measuring the speed of sound by performing a resonance column ex...

    Text Solution

    |

  4. A wave travelling along the x-axis is described by the equation v(x, t...

    Text Solution

    |

  5. Three sound waves of equal amplitude have frequencies (n-1), n, (n + 1...

    Text Solution

    |

  6. A motor cycle starts from rest and accelerates along a straight path a...

    Text Solution

    |

  7. The equation of a wave on a string of linear mass density 0.04 kgm^(-1...

    Text Solution

    |

  8. The transverse displacement y(x, t) of a wave on a string is given by ...

    Text Solution

    |

  9. Statement-1: Two longitudinal waves given by equation y(1)(x,t)=2asin(...

    Text Solution

    |

  10. A transverse wave travelling along the positive x-axis, given by y=A s...

    Text Solution

    |

  11. A cylindrical tube, open at both ends, has a fundamental frequency f i...

    Text Solution

    |

  12. A sonometer wire of length 1.5m is made of steel. The tension in it pr...

    Text Solution

    |

  13. A pipe of length 85cm is closed from one end. Find the number of possi...

    Text Solution

    |

  14. A train is moving on a straight track with speed 20 ms^(-1). It is blo...

    Text Solution

    |

  15. A bat moving at 10 ms^(-1) towards a wall sends a sound signal of 8000...

    Text Solution

    |

  16. A source of sound emits sound waves at frequency f(0). It is moving to...

    Text Solution

    |

  17. A uniform string of length 20m is suspended from a rigid support. A sh...

    Text Solution

    |

  18. A cylindrical tube, open at both ends, has a fundamental frequency f i...

    Text Solution

    |

  19. Two engines pass each other moving in opposite directions with uniform...

    Text Solution

    |

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

    Text Solution

    |