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Two speakers are placed in a large, open space and are made to emit the same constant-frequency sound with the same volume. A student walks around that space, listening to the resultant sound.

Which of the following observations would provide evidence that the two sound waves are interfering?


The sound is loudest near the speakers and gets quieter as the student gets farther from the speakers.


The perceived frequency increases as the student moves toward the speakers and decreases as they move away from the speakers.


When the student walks in a circle around the speakers, the perceived loudness of the sound increases and decreases multiple times as the student makes one lap.


When the speakers first turn on, the student hears one speaker before the other.

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