Flashcards in 4.7 Superposition And Interference Deck (12):

1

## What is the principle of superposition?

### When two waves of the same kind meet the resultant displacement is the sum of the individual displacements.

2

## What happens when waves meet exactly crest to crest?

### CONSTRUCTIVE interference occurs and the wave has double the amplitude of the individual waves.

3

## What happens when waves meet crest to trough?

### DESTRUCTIVE interference occurs when the wave has zero amplitude since the amplitudes have cancelled out.

4

## What determines whether we have constructive or destructive interference?

### On the difference in path length to that point from each source.

5

## What is the difference in distances called?

### Path difference.

6

## When does constructive interference occur in regards to path difference?

### When the path difference divided by the wavelength is a whole integer.

7

## When does destructive interference occur in regards to path difference?

### When the path difference divided by the wavelength is a half integer.

8

## When are two wave sources coherent?

### When their waves are exactly in step with one another.

9

## What happens when light is diffracted through slit?

### The waves superpose at a screen far away.

10

## What does the intensity pattern shown from when the waves are diffracted through the slits?

### Equally spaced maxima with equal intensities.

11

## What do the maxima and minima of the intensity pattern depend on?

### Path difference from the two slits.

12