4.4 Wave Behaviour

Question 1

Law of Reflection

Answer 1

Angle of incidence (i) is equal to angle of reflection (r)

Question 2

Refraction

Answer 2

Takes place at the boundary between two different media, where a wave will undergo a change in direction due to a change in speed wave when transitioning from one medium to another

Question 3

Rule of Refraction

Answer 3

As ray travels into optically denser medium, ray of light is refracted towards normal

Question 4

Snell’s Law

Answer 4

sinθ2/sinθ1 = c2/c1

Question 5

Snell’s Law for Light

Answer 5

sinθ2/sinθ1 = c2/c1 = (c/c1)/(c/c2) = n1/n2 or n1sinθ1 = n2sinθ2

Question 6

Total Internal Reflection

Answer 6

hfu

Question 7

Critical Angle

Answer 7

Angle at which reflected ray is refracted at 90 degrees

Question 8

Critical Angle Formula

Answer 8

sinθc = 1/n2

Question 9

Reflection

Answer 9

The act of rebounding off a medium intersection into the same medium once again

Question 10

Transmission

Answer 10

The act of passing through a medium, into another medium

Question 11

Incident Ray

Answer 11

The ray traveling towards a medium intersection and towards a normal

Question 12

Reflected ray

Answer 12

The ray which has been rebounded off the medium boundary, and is travelling away from the normal

Question 13

Normal

Answer 13

A line which is perpendicular to two mediums

Question 14

Specular Reflection

Answer 14

A single ray of light strikes a smooth mirror it producing a single reflected ray.

Question 15

Diffuse Reflection

Answer 15

Diffuse reflection occurs when a single incident ray is generally scatted in all directions.

Question 16

Diffraction

Answer 16

When waves pass through apertures they tend to spread out, or around objects

Question 17

Wavelength in Diffraction

Answer 17

Smaller slit results in a greater increase in wavelength

Question 18

Single-Slit Diffraction Observations

Answer 18

Central maximum intensity
Other maxima occurs roughly halfway between minima
As angle increases, intensity of maxima decreases

Question 19

Coherent Sources

Answer 19

Same frequency

Constant phase relationship

Question 20

Two Source Interference

Answer 20

Emission of two coherent waves which have roughly the same amplitude

Question 21

Path Difference

Answer 21

Difference in distance of the point from both sources

Δr = |S1P - S2P|

Question 22

Constructive Interference

Answer 22

When path difference |S1P - S2P| = nλ (n = 0,1,2,3…0) or when waves in phase

Question 23

Destructive Interference

Answer 23

When path difference |S1P - S2P| = (n+1/2)λ (n = 0,1,2,3…) or when waves exactly out of phase

Question 24

Double Slit Interference

Answer 24

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