Constructive vs Destructive Inference

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KarineKim2L
Posts: 85
Joined: Fri Aug 30, 2019 12:16 am

Constructive vs Destructive Inference

Postby KarineKim2L » Sun Oct 13, 2019 10:17 am

Can someone explain the difference between constructive and destructive inference? I understood that constructive inference is waves in phase and destructive inference is waves out of phase, but I don't really understand what that means.

Aliya Jain 2B
Posts: 86
Joined: Wed Sep 11, 2019 12:16 am

Re: Constructive vs Destructive Inference

Postby Aliya Jain 2B » Sun Oct 13, 2019 10:26 am

Constructive interference happens when two waves meet so that their crests line up together, which results in a wave with a higher amplitude. In destructive interference, the crest of one wave meets the trough of another, resulting in a lower total amplitude.

The Khan academy video about this is really good!
https://www.khanacademy.org/science/phy ... terference

Elizabeth Harty 1A
Posts: 106
Joined: Sat Jul 20, 2019 12:16 am

Re: Constructive vs Destructive Inference

Postby Elizabeth Harty 1A » Sun Oct 13, 2019 10:39 am

You can also use the concept of destructive interference to explain why electrons can only be found in certain energy levels (because destructive interference cancels the wave functions).

https://www.sciencedirect.com/topics/ma ... terference

^ Here is another good link.

DHavo_1E
Posts: 96
Joined: Sat Aug 17, 2019 12:17 am

Re: Constructive vs Destructive Inference

Postby DHavo_1E » Sun Oct 13, 2019 10:43 am

KarineKim1L wrote:Can someone explain the difference between constructive and destructive inference? I understood that constructive inference is waves in phase and destructive inference is waves out of phase, but I don't really understand what that means.


Hi,

Constructive interference happen when waves have equal frequency and are in phase as you said, so the resulting amplitude is the sum of the individual waves, whereas destructive interference results in a smaller amplitude because the peak of one is aligned with the trough of the other.
Here is an example:
IMG_0233.jpg
Picture of Constructive and Destructive Interference


Found on this website: https://www.physics-and-radio-electroni ... rence.html which also explains in further detail the concepts of constructive and destructive interference
Last edited by DHavo_1E on Sun Oct 13, 2019 10:46 am, edited 1 time in total.

Veronica Lu 2H
Posts: 74
Joined: Wed Sep 18, 2019 12:18 am

Re: Constructive vs Destructive Inference

Postby Veronica Lu 2H » Sun Oct 13, 2019 10:45 am

constructive inference is is "constructive" in the sense that its crests are aligned with that of another waves, which does create a higher amplitude. On the other hand, destructive inference is when the waves are unaligned and creates a lower amplitude.


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