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NEET 2014
Exam
NEET
Year
2014
Subject
Physics
Chapter
Waves and Sound

NEET 2014 · Physics · Waves and Sound

The number of possible natural oscillations of air column in a pipe...

The number of possible natural oscillations of air column in a pipe closed at one end of length 85cm85cm whose frequencies lies below 1250Hz1250Hz are: (velocity of sound =340ms−1= 340{ms}^{- 1})

Options

  1. A44
  2. B55
  3. C77
  4. D66

Correct answer

D. 66

Step-by-step solution

Fundamental frequency of a closed organ pipe is f1=V4l=3404×0.85=100Hz{f}_{1} = \dfrac{V}{4l} = \dfrac{340}{4 \times 0.85} = 100Hz
The natural frequencies of the organ pipe will be f=100Hz,300Hz,500Hz,700Hz,900Hz,1100Hzf = 100Hz, 300Hz, 500Hz, 700Hz, 900Hz, 1100Hz which are below 1250Hz1250Hz

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