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.
Constructive Destructive  You are 3.5? away from speaker A; 3? away from speaker B and at the speakers the waves are exactly in phase.
Constructive Destructive  You are 3.5? away from speaker A; 3? away from speaker B and at the speakers the waves are exactly out of phase.
Constructive Destructive  You are 3? away from speaker A; 2? away from speaker B and at the speakers the waves are exactly out of phase.
Constructive Destructive  You are 3? away from speaker A; 2? away from speaker B and at the speakers the waves are exactly in phase.

Explanation / Answer

Constructive interference (loud) when in phase (1 & 4).
Destructive interference (quiet) when out of phase (2 & 3).
When the sound waves meet somewhere (interfere) they add together (constructive) when in phase, or cancel out (destructive) when out of phase. You just need know the words - You don't need any numbers yet, since theres no calculation involved.

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