Two sound waves of the same frequency and amplitude are broadcast from speakers at opposite ends of a theater. in the middle of the theater, you hear a sound 6 db louder than that from either speaker. which of the following is true?

a) the two waves are in phase in the middle of the theater.

b) the two waves are 180° out of phase in the middle of the theater.

c) the two waves are 90° out of phase in the middle of the theater.

d) the two waves are 45° out of phase in the middle of the theater.