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In the diagram above, a machine with a reciprocating piston is attached to a rope and used to create transverse waves on the rope.
Which of the following changes would cause the machine to create longitudinal waves instead of transverse waves?
Move the machine to the middle of the rope.
Tune the frequency of the device to make the wavelength of the wave the same as the length of the string.
Rotate the machine 90 degrees clockwise.
Decrease the amplitude of the machine's movements.