Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
11 Cards in this Set
- Front
- Back
|
Principle of superposition |
1. When two waves meet, the resultant displacement is the vector sum of the two displacements. 2. After the waves separate, they travel in their original directions, as if nothing has happened. |
|
|
Stationary waves |
Stationary waves are formed when waves of the same frequency and amplitude travelling in opposite direction superpose each other. |
|
|
Node |
The particles at nodes are always at rest, their oscillation amplitudes are zero |
|
|
Antinodes |
The particles at the antinodes have the largest oscillation amplitude. |
|
|
Loop |
1/2 of the wavelength |
|
|
Conditions for interference |
Interference occurs if 1. The wave have the same frequency 2. The waves have a constant phase difference |
|
|
Coherent |
Two waves(or their wave sources) with a constant phase difference are coherent. |
|
|
Incoherent |
No stable interference pattern can be formed if the waves are incoherent. |
|
|
Constructive interfernece |
It occurs at a point where the path differnece is 0λ, λ, 2λ...mλ |
|
|
Destructive interference |
It occurs at a point where the path difference is 1/2λ, 3/2λ, 5/2λ...m/2λ |
|
|
Describe how bright and dark fringes being produced |
Dark fringes are the result of destructive interference when the waves are out of phase, whereas bright fringes are formed by constructive interence when the waves are in-phase |
