Symmetrical Interference
Constructive and destructive interference in repeating patterns
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Video Instruction showmethephysics.com
Constructive and Destructive
Move your mouse over the animation below
2. Symmetrical Lines of Interference - wave patterns produced
Interference Animation (Right Click, Save As)
Two Slit Diffraction
What kind of interference
What kind of interference
When crest does not align with crest,
90 degrees out of phase
Made using a spreadsheet created
Use the slider
Maximum Destructive Interference
Made using a spreadsheet created
Phase Difference - 1/2 wavelength How many degrees is the shift?
180 degrees
Double Slit
Ex) Name the interference at A, B, C, D?
June 2012
Try it yourself — tune the two speakers and match the beat.
[ Open Beat Frequency Lab in a new tab ]
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Check Your Understanding
5 quick questions — pick an answer to see if you’re right.
1. Maximum constructive interference occurs when
2. Two overlapping waves have a phase difference of ½ wavelength. How many degrees is that, and what interference results?
3. Two waves, each with amplitude 3 cm, meet in phase. What is the amplitude of the resulting wave?
4. Two waves with the same amplitude meet 90° out of phase, so crest doesn't line up with crest. The result is
5. Symmetrical lines of interference are produced by