So an interference pattern must have both to identify it is a pattern How are two coherent waves formed? Remember interference pattern must have both maxima and minimas Interfernce pattern It is when two coherent waves meet to form an interference pattern both destructive and constructive interference onto a screen The phase difference of 360° is same as 0° and also the same as 720° and so onĪlso waves do not have to be the same amplitude but, must have the same frequency (coherent). However, we just need to know the two specific angles in which the maximum and the lowest resultant is formed Notes to rememberĪs mentioned, phase difference increases every 360°, which means the destructive interference at 180° is also the same as 540°. It is not truly destructive or constructive. At this point, the waves fully joins together in the maximum way possible, resulting in the Highest resultant wave displacement What about other phase difference angles? It always is 360° and so it is a specific point or difference. Inphase - Contructive interference It is when coherent waves of phase difference of 360° or 2π meet to interfere constructively At this point, the waves fully cancel out each other in the maximum way as possible, resulting in the lowest resultant wave displacement It always is 180° and so it is a specific term or difference. Out of phase/Antiphase - Destructive interference It is when coherent waves with a phase difference of 180 or π meet to interfere destructively So as we know what are coherent waves, we will talk about the specific terms of interference, but before that we need to know what's out of phase and in phase It is when two coherent waves meet, the resultant wave displacement is the sum of the individual wave displacementsĬoherent waves When two or more waves have a constant phase difference at any given time Interference is a highly specific category under superposition which deals with only coherent waves and has specific terms when the maximum resultant and the minimum resultant is formed. When you have enough points, draw the smooth wave curve When they give two waves, they each have a displacement at a particular point - either positive or negative or same.Īt different points, take the sum of the displacements of the two wave at that particular time like above and so plot the resultant wave points You will need to know how to draw the resultant wave The purple wave is the resultant wave The resultant wave formed can be larger than the individual waves or smaller. The idea is very simple, when two waves meet they form a resultant wave, the waves do not need to be coherent and identical in frequency. It is a highly general term and so there is no thing called constructive and destructive superposition You need to know somethings in superposition. Superposition When two or more waves meet, a resultant wave is formed in which the displacement is the sum of the individual displacements of the waves Back Next Superposition, Interference & Diffraction Grating
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