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Questions on superpositioning.

Asked by Siblinings (136points) February 20th, 2010

http://i170.photobucket.com/albums/u276/saenbateman/wave-1.jpg?t=1266656561
Some of the output of the transmitter (by the wire shown )directly to the receiver and is then compared with the reflected signal.

The receiver is detecting a maximum, the sheet is moved 7.5mm towards the device, the intensity falls to a minimum, why?

Now it is because the waves coming back are interfering with some of the output the receiver from the transmitter?

The signal is also not 0 is this because the wave going to the metal and back has lost strength?

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