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A person whirls a sound tube with a period of 3 rotations per second and a radius of 0.75m. If they hear a pitch of

A person whirls a sound tube with a period of 3 rotations per second and a radius of 0.75m. If they hear a pitch of 880 Hz (A on a piano)

a. what are the approach and departure speeds of the tube end?

b. what range of frequencies does the class hear?

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