Module 2

Question 1

What theories of light did Isaac Newton propose?

Answer 1

Particle Theory

Corpuscular Theory

Question 2

Who proposed the Particle Theory of light?

Answer 2

Isaac Newton

Question 3

Who proposed the Corpuscular Theory of light?

Answer 3

Isaac Newton

Question 4

What theory of light did Robert Hooke and Huygens propose?

Answer 4

Wave Theory

Question 5

Who proposed the Wave Theory of light?

Answer 5

Robert Hooke & Huygens in the 1600’s

Question 6

Who substantiated the wave theory of light through the Double Slit experiment?

Answer 6

Thomas Young in 1800

Question 7

What did Thomas Young do in 1800?

Answer 7

Substantiated the Wave Theory of light through the Double Slit experiment

Question 8

Who proposed that light is electromagnetic radiation and waves are transverse?

Answer 8

James Maxwell

Question 9

What did James Maxwell propose?

Answer 9

That light is electromagnetic radiation and waves are transverse

Question 10

Who didn’t agree with the Wave Theory, but instead believed light was discrete packets of energy called quanta (later renamed photons)?

Answer 10

Max Plank

Question 11

Who was Max Plank?

Answer 11

He didn’t agree with the Wave Theory of light, but instead believed that light was discrete packets of energy called quanta (later renamed photons)

Question 12

What Theory of light did Max Plank propose?

Answer 12

Quantum Theory of Light in 1900 - light is radiated and absorbed continuously in small units (photons)

Question 13

Who proposed the Quantum theory of light?

Answer 13

Max Plank

Question 14

Who proposed that the behavior of light had characteristics of both the wave and particle theory?

Answer 14

Albert Einstein in 1905

Question 15

What theory of light did Albert Einstein believe?

Answer 15

That the behavior of light had characteristics of both the wave and particle theory

Question 16

Explain the Double Slit experiment

Answer 16

One surface, one slit
Second surface, two slits
Strip pattern appears (light and dark)
Interference pattern, two types (constructive interference and destructive interference)

Question 17

What is constructive interference?

Answer 17

When the waves meet the amplitudes are added together (increased)

Question 18

What is destructive interference?

Answer 18

When the waves meet the amplitudes cancel each other out (crest meets the trough)

Question 19

What are the 3 parts of a wave?

Answer 19

Crest
Trough
Wavelength

Question 20

What is the top of a wave called?

Answer 20

Crest

Question 21

What is the bottom of a wave called?

Answer 21

Trough

Question 22

What is the distance from a point on one wave to the corresponding point on the next wave?

Answer 22

Wavelength

Question 23

What is the number of waves that pass in 1 second called?

Answer 23

Frequency

Question 24

What is the distance that the wave will travel in 1 second called?

Answer 24

Speed

Question 25

What is the distance from the center line to the peak or to the valley of a wave called?

Answer 25

Amplitude

Question 26

What is the electromagnetic spectrum (nm) from shortest wavelength (highest freq) to longest wavelength (shortest freq)?

Answer 26

``` Gamma Rays (10 to the -14) UV (10 to the -8) Visible light (10 to the -6) IR radiation (10 to the -4) A-C (10 to the 8) ```

Question 27

List the order of colors in the visible spectrum

Answer 27

``` Red (700 nm) Orange Yellow Green Blue Indigo Violet (400 nm) ```

Question 28

What is the speed of light?

Answer 28

3 x 10 to the 8 m/sec or 186,000 miles/sec

Question 29

Wavelength and frequency have what type of relationship?

Answer 29

Inversely proportionate

Question 30

What is a photon?

Answer 30

smallest amount of light possible; a particle of light; that travels in a straight line unless it changes speed or passes a barrier

Question 31

What is a ray?

Answer 31

the path of a single photon of light from a single point on a light source

Question 32

What are pencils?

Answer 32

a group of rays divergent from a single point on a light source

Question 33

What is a beam of light?

Answer 33

the group of pencils originating from all of the points on a light source

Question 34

What is the formula for velocity of light?

Answer 34

v (speed of light) = freq x wavelength

Question 35

What is the index of refraction?

Answer 35

the ratio of light in a vacuum to the speed of light in another medium

Question 36

What is the normal?

Answer 36

a line perpendicular to the reflecting surface at the point of reflection

Question 37

What is the angle of reflection?

Answer 37

the angle at which the light ray is reflected

Question 38

What does the angle of incidence equal?

Answer 38

the angle of reflection

Question 39

What does Snell's Law deal with?

Answer 39

Refraction of a single light ray

Question 40

What is refraction?

Answer 40

The bending of light by a lens or optical system

Question 41

What is the refractive index of air?

Answer 41

1

Question 42

What is the formula for angle of deviation?

Answer 42

d = i - i'

Question 43

What is the formula for Snell's Law?

Answer 43

``` n sin i = n' sin i' where n = refractive index of material 1 n' = refractive index of material 2 i = angle of incidence i' = angle of refraction ```

Question 44

What is the refracted ray?

Answer 44

the angle between the normal and the path of the refracted ray

Question 45

What are the 3 possible outcomes of Snell's Law?

Answer 45

Light bends toward the normal Light bends away from the normal Light travels unrefracted when incident at 90 degrees to the interface