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I was having trouble understanding what diffraction patterns were. The professor mentioned constructive (waves in phase) and destructive interference (waves out of phase). Are were supposed to know how to draw those or just understand the concept of them. And if so can you please explain.
If the peaks and troughs of a wave match up then they are constructive and when the two waves match up then their amplitudes will increase because they both help to build each other. However when the peak and trough of two waves hit then they become destructive and the wave amplitude will decrease. I think we have to just understand the concept of them and know that it is a property of waves.
For diffraction patterns, the typical example would be having a barrier in the middle of a room with a tiny opening the size of an electron. If electrons behaved like particles, when electrons are sent toward the opening, they would pass through one by one, straight to the end of the room. However, when electrons are sent through, they diffract, meaning they bend and spread out.
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