Unformatted text preview: al Waves, General Interference • When is other than 0 or an
even multiple of , the
amplitude of the resultant is
between 0 and 2A
• But still a sinusoidal wave!
(This is not true if frequency,
wavelength or amplitude are
not the same) Sinusoidal Waves, Summary of Interference
• Constructive interference occurs when
= 0, 2 , 4
– Amplitude of the resultant is 2A
• Destructive interference occurs when
= n where n is an odd integer
– Amplitude is 0
• General interference occurs when
0< <n
– Amplitude is 0 < Aresultant < 2A Standing Waves Standing Waves – the waveform
• Assume two waves traveling in opposite directions in a
medium with the same amplitude, frequency and
wavelength
• y1 = A sin (kx – t) and y2 = A sin (kx + t)
• They interfere according to the superposition principle:
y= 2A sinkxcos t
• Standing wave, that oscillates in time Standing Waves, zeros and maxima
• A node occurs at a point of zero amplitude
– These correspond to positions of x where • An antinode occurs at a point of maximum
displacement, 2A
– These correspond to positions of x where...
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This document was uploaded on 02/21/2014 for the course CHEM 110A 110a at UCLA.
 Winter '13

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