Question

68. In a resonating air column experiment with a closed-end tube, if first
resonance occurs when the length of the air column is 10 cm. Second resonance
occurs at
(a) 5 cm
(b) 20 cm
(C) 30 cm
(d) 40 cm​

Answer 1

Answer:

b will be the right answer I I can't show the calculation but I had done in my copy