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A $10.0 m$ long PVC pipe is attached to a speaker at one end and it is sealed at the other end. A microphone is placed next to the speaker. The PVC pipe is filled with an unknown gas. The speaker emits a short click and the microphone records the following pattern as a function of time. Note that the data recorded by the microphone does not include the initial loud pulse from the speaker—only the reflections within the pipe are recorded.

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Using data obtained from the graph estimate the approximate speed of sound in the unknown gas?


$344 m/s$


$640 m/s$


$1280 m/s$


$1920 m/s$


$2560 m/s$