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# Determine Frequency from Graph

APPH12-IZJGGU

The graph above shows the changes in air pressure at a certain location as a function of time as caused by a single sound wave. Which of the following most closely approximates the frequency of that sound wave?

A

$0.015 \text{ sec}$

B

$0.033\text{ sec}$

C

$30.3\text{ Hz}$

D

$65\text{ Hz}$