There are two speakers at the front of the room. Each is outputting a 250Hz pure

Question

There are two speakers at the front of the room. Each is outputting a 250Hz pure tone. For each of the following situations, will you hear constructive interference (a loud noise) or destructive interference (soft or no noise). ? represents the wavelength of the 250Hz tone.
1.You are 3? away from speaker A; 2.5? away from speaker B and at the speakers the waves are exactly in phase.
2.You are 3? away from speaker A; 2? away from speaker B and at the speakers the waves are exactly out of phase.
3.You are 3? away from speaker A; 2.5? away from speaker B and at the speakers the waves are exactly out of phase.
4.You are 3? away from speaker A; 4? away from speaker B and at the speakers the waves are exactly in phase.

Constructive or destructive

Explanation / Answer

constructive interference (loud) when in phase (1 & 3).

Destructive interference (quiet) when out of phase (2 & 4).

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