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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?

A

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

B

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

C

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.

D

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

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