physics

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a pipe of length 1.00 m and open at both ends is lying on the ground at a construction site on a windy day of temperature 20 degrees C. Justin notices that the pipe is resonating and creating a sound of a particular frequency, the fundamental frequency.
a) what is this frequency?
b)just for fun, justin uses a board to close up one end of the pipe. the pipe now acts as a closed-tube resonator. what fundamental frequency does he now hear?

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