Which property of a sound wave increases as the pitch of the sound increases? A. Frequency
B. Wavelength
C. Rest position
D. Amplitude

it's A, I'm taking this test on apex and got it right. hope this helps!

Explanation:

also here's an explanation: The frequency of a sound wave is what your ear understands as pitch. A higher frequency sound has a higher pitch, and a lower frequency sound has a lower pitch. In Figure 10.2 sound A has a higher pitch than sound B.

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answer; convade;