Science In Pan Flute

The pan flute or pan pipe is an ancient musical instrument based on the principle of the closed tube, consisting usually of five or more pipes of gradually increasing length. The pan flute is an end-blown flute. Which of the following explanations is correct?

a) The sound of a pan flute is generated by the vibration of tube.
b) The sound generated by a shorter tube has a higher frequency than the sound generated by a longer tube.
c) The speed of the sound generated by a shorter tube is faster than the speed of sound generated by a longer tube.

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