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Consider the case of normal modes of vibration for the air column with only one end closed. What is the length of the air column for the fundamental harmonic?

(a) λ/2

(b) λ

(c) 2λ

(d) λ/4

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Asked question is from Reflection of Waves topic in portion Waves of Physics – Class 11

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Right answer is (d) λ/4

The best I can explain: For the given condition wavelength is related to length by: λ = 4L/(2n+1).

∴ For fundamental harmonic n=0, & L = (2n+1)λ/4

= (0 + 1)λ/4

= λ/4.

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