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This is a standard demonstratiom used in many schools and colleges to demonstrate the basic principles of waves. A signal generator is connected to an oscilloscope & a loud speaker. Some signal generators havev two outputs one marked with a low value impedance e.g. 8 &Omega: the other maked with a hogh value e.g 600 @Omega;. In this case the high impedence output goes to t6he osciilascope, the low to the speaker. If there is only one output coneection stackable 4mm plugs are used to connect both devices to the signal generator.