Question

A cylinder tube, open at both ends, has a fundamental frequency $f$ in air. The tube is dipped vertically in water so that half of it is in water. The fundamental frequency of the air column is now:

• A. $f/2$
• B. $3f/4$
• C. $f$
• D. $2f$

Answer 1

The correct option is C $f$

Change in medium of propagation alters the speed and wavelength of wave keeping frequency constant.

Therefore, the fundamental frequency of air column is $f$ when dipped in water.