Physics

Problem

Two speakers separated by some distance emit sound of the same frequency. At some point

P

the intensity due to each speaker separately is

I_0

. The path difference from

P

to one of the speakers is

\frac{1}{2}\lambda

greater than that from

P

to the other speaker. What is the intensity at

P

if a. the speakers are coherent and in phase; b. the speakers are incoherent; c. the speakers are coherent but have a phase difference of

180^\circ