demo15 - Demonstration for Class 15 - Interference of Waves...

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Demonstration for Class 15 -- Interference of Waves If you shout "HELLO!" at the Grand Canyon, you will hear " HELLO! " return back in a few seconds. But suppose you shout the entire Gettysburg Address? You will be shouting "...our forefathers brought forth on this land. .." when " Four score and seven years ago " returns as the echo. Your outgoing speech will be interfering with the echo and will create a jumble of words. What would happen if you sent out in a tight beam a continuous wave of single frequency and amplitude. When it reflects back, it would interfere with the outgoing wave. In some places, it might interfere "constructively" producing maximum sound and in others, "destructively" producing zero sound. Where you get maxima and minima, and even if you do, depends on the length of the path the sound takes, and the frequency or wavelength of the sound. With the right frequency and path length, you can set up a "standing waves" --- a wave that appears to be fixed in space. When a wave reflects from a fixed end, like the end of a
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demo15 - Demonstration for Class 15 - Interference of Waves...

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