Question

An air column, closed at one end and 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

(a) 150 cm

(b) 200 cm

(c) 66.7 cm

(d) 100 cm

Answer 1

Correct option (a) 150 cm

Explanation :

From figure,

First harmonic is obtained at

Third harmonic is obtained for resonance,