Shown below are various pipe systems the solid lines represe

Shown below are various pipe systems (the solid lines represent thin pipes seen from the side).
A sound wave of wavelength L enters the pipe system from the left. When the sound reaches the junction, it splits. The sound waves in the two branches of the junction recombine at Q. Select those diagrams for which the sound intensity at Q will be a minimum; e.g., enter BC

A) B) C) D) E) F)

Solution

Sound intensity is W / area

Soo greater the.area lesser is intensity

Area of A = 1.04 L

Area of B = 2.694 L

C = 1.57 L

D = 5.43 L

E = 3.01 L

F = .25 L

Therefore the least is D having minimum sound intensity