week-13-1

# week-13-1 - Sound waves light waves water waves 1S-13...

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4/11/2011 Physics 214 Fall 2010 2 1S-13 Slinky on Stand Creating longitudinal compression waves in a slinky What happens when you pull back and release one end of the slinky ?
Moving one end of the Slinky back and forth created a local compression where the rings of the spring are closer together than in the rest of the Slinky. The slinky tries to return to equilibrium. But inertia cause the links to pass beyond. This create a compression. Then the links comes back to the equilibrium point due to the restoration force, i.e. the elastic force. The speed of the pulse may depend on factors such as tension in the Slinky and the mass of the Slinky.

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Energy is transferred through the Slinky as the pulse travels. The work done in moving one end of the Slinky increases both the potential energy of the spring and the kinetic energy of individual loops. This region of higher energy then moves along the Slinky and reaches the opposite end. There, the energy could be used to ring a bell or perform other types of work. Energy carried by water waves does substantial work over time in eroding and shaping a shoreline.
If instead of moving your hand back and forth just once, you continue to produce pulses, you will send a series of longitudinal pulses down the Slinky. If equal time intervals separate the pulses, you produce a periodic wave . The time between pulses is the period T of the wave. The number of pulses or cycles per unit of time is the frequency f = 1/T .

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week-13-1 - Sound waves light waves water waves 1S-13...

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