There are two kinds of Slinky springs: One is a long, narrow steel helical spring with a diameter of 2 cm and a length of 1.8 m which can be extended to 9 m, and the other is a large helical spring with a diameter of 7.3 cm and a closed length of 10 cm. Wave pulses may be given to the spring which will travel down the spring. The properities of reflections from fixed and free ends may be observed.



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