Two loudspeakers are placed 3-m apart. they emit 498 hz, Ask an Expert

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Q. what is the ideal mechanical advantage of a ramp if its length is 4.0 m and its higher end is 0.5 m above its lower end?

Q. Two loudspeakers are placed 3-m apart. They emit 498 Hz sounds, in phase. A microphone is placed 3.2m distant from a point midway between the two speakers, where an intensity highest is recorded.

Presume the speakers are reconnected so that the 498 Hz sounds they emit are exactly out of phase. At what positions is the intensity highest and least now?

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