12.1-12.3 Superposition Interference Quizlet Cards Flashcards Preview

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Flashcards in 12.1-12.3 Superposition Interference Quizlet Cards Deck (18)
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1

What is the principle of superposition

When two waves meet at a point the resultant displacement is the (vector) sum of the displacements of the individual waves.

What is

2

What is constructive interference?

When two waves superpose in phase causing an increase amplitude.

3

What is destructive interference?

When two waves superpose in antiphase causing a decreased amplitude.

4

What are coherent sources of waves?

Sources that emit waves with a constant phase difference (and the same frequency).

5

What is an interference pattern?

A pattern of regions of constructive and destructive interference produced by coherent sources of waves.

6

What path difference is required for waves to be in phase?

A whole number of wavelengths

7

What path difference is required for waves to be in anti-phase?

An odd number of half wavelengths

8

What is the relationship between path difference and phase difference for coherent sources?

(Path difference/wavelength) x 2π

9

What term describes a phase difference of zero between two waves?

In phase

10

What term describes a phase difference of π radians between two waves?

In antiphase

11

What is x in the double slit equation (λ = ax/D)?

Fringe seperation

12

What is D in the double slit equation (λ = ax/D)?

Distance between the double slits and the screen

13

What is a in the double slit equation (λ = ax/D)?

Distance between the double slits

14

What occurs to cause a dark fringe in the double slit experiment?

Destructive interference of the light from each slit

15

What occurs to cause a bright fringe in the double slit experiment?

Constructive interference of the light from each slit

16

What did Young's double slit experiment demonstrate about the nature of light?

That light exhibits wave behaviour.

17

What name is given to light of a single frequency/wavelength?

Monochromatic

18

Why did Young place a single slit before the double slit?

To ensure the light from each of the double slits was in phase.