120. Rubber Hose or Wave Spring

Clamp a wave spring or rubber hose to the table and you can send a pulse along and see it reflected. The brass spring works best. Free end reflection can be accomplished by attaching a 1/2 meter long string to the end of the spring. If the end of the hose or wave spring is laid on the floor, you can send a pulse down and have it absorbed with no reflection.

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To see Gueorgui explain this demonstration click here