Hi there, I need help with this physics question. Please show your work. Thank y

Question

Hi there,

I need help with this physics question. Please show your work. Thank you.

Before I go on, here is one correction: For diagram D, change 0.88 to 0.44.

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.

Explanation / Answer

Where the path difference is nL/2
minimum for A & F
path difference = 3L/2

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