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Waves question

2016 · Q158
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Waves question

2016 · Q158

NEETPhysicsWavesMCQ+4 / −1
An air column, closed at one end open at the other, resonates with a tuning fork when the smallest length of the column is 50 cm. The next larger length of the column resonating with the same tuning fork is
  1. A
    150 cm
  2. B
    200 cm
  3. C
    66.7 cm
  4. D
    100 cm
View written solutionFree

Correct answer: A

From figure,

NEET 2016 Phase 1 Physics - Waves Question 55 English Explanation


First harmonic is obtained at

l=λ4=50 cml = {\lambda \over 4} = 50\,cml=4λ​=50cm

Third harmonic is obtained for resonance,

l′=3λ4=3×50=150 cml' = {{3\lambda } \over 4} = 3 \times 50 = 150\,cml′=43λ​=3×50=150cm

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