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You are standing at the midpoint between two speakers, a distance D away from each. The...

You are standing at the midpoint between two speakers, a distance D away from each. The speakers are playing the exact same sound of frequency 170 Hz in phase with each other. Describe what happens when you walk 1 m directly toward one of the speakers. Assume the speed of sound is 340 m/s. Also assume you can't hear any sounds except those produced by the speakers.

You begin by hearing nothing, but the sound gets louder. Then it gets quieter again until you can't hear it anymore.

You begin by hearing a loud sound that gets quieter until you can't hear it anymore. Then it gets louder again until it is as loud as where you started. Then it gets quieter again until you can't hear it anymore.

You begin by hearing a loud sound that gets quieter until you can't hear it anymore.

You begin by hearing nothing, but the sound gets louder.

You begin by hearing a loud sound that gets quieter until you can't hear it anymore. Then it gets louder again until it is as loud as where you started.

You begin by hearing nothing, but the sound gets louder. Then it gets quieter again until you can't hear it anymore. Then it gets louder again.

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