1)

A pipe open at both ensa has a fundamental frequency f in air. The pipe is dipped vertically in the water, so that half of it is in water, The fundamental frequency of the air column is now


A) f2

B) 3f4

C) 2f

D) f

Answer:

Option D

Explanation:

The fundamental frequency  of open pipe 

                          f=v2l

  Now, after half-filled with water it becomes a closed pipe of length l/2

The fundamental frequency of this closed pipe.

                f=v4(l2)

                                   = v2l=f