Figure 7.88 shows a stretched string of length `L` and pipes of length `L` , `2L` , `L//2` and `L//2` in options (a) , (b), (c ) and (d) respectively . The string 's tension is adjusted until the speed of waves on the string equals the speed of sound waves in the air . The fundamental mode of oscillation is the set up on the string . In which pipe will the sound produced by the string cause resonance ?

Options

A.
B.
C.
D.

Answer

B