Unit 4: Electromagnetic Waves

Question 1

L1
What is the source of all waves?

Answer 1

• Vibrations

Question 2

L1
What is the units for frequency?

Answer 2

• cycle / s
• 1/s

Question 3

L1
In a transverse wave, what does the amplitude represent?

Answer 3

• The energy

Question 4

L1
What are Maxwells law?

Answer 4

1. Distribution of electric charge is related to the net electric field
2. Magnetic field is continuos, electric field start and end on electric charge
3. Changing electric produce magnetic
4. Changing magnetic produce electric

Question 5

L1
What is the source of all EMR?

Answer 5

• An accelerating charge

Question 6

L1
List all forms of EMR from lowest f to highest f

Answer 6

• Leader RM, my boy IV, UV, XG

Question 7

L2
What did Galileo do?

Answer 7

• Two hilltops, two people, two lanterns
• Know the distance, flash the lantern, flash the other lantern, determine the time using pulse

Question 8

L2
What did Romeo & Huygens do?

Answer 8

• Used the eclipse of Jupiter and diameter of Earths orbit

Question 9

L2
What did Michelson do?
THE MOST IMPORTANT PERSON

Answer 9

• 8 sided mirror rotating at minimum frequency

Question 10

L2
What is the equation for the speed of light?

Answer 10

v = 2D n/ T

Question 11

L3
How to draw the normal?

Answer 11

• Perpendicular to the surface.

Question 12

L4
Less to More Dense?
Low to High?
Fast to Slow?

Answer 12

Towards the normal

Question 13

L4
More to Less Dense?
High to Low?
Slow to Fast?

Answer 13

Away from the normal

Question 14

What is a critical and what are the two conditions for it?

Answer 14

Critical Angle: Angle where the refracted ray seem to disappear

1. SLOW TO FAST
2. 0r is 90

Question 15

What is TIR and what are the two conditions?

Answer 15

TIR = no refracted ray

1. SLOW TO FAST
2. 0i > 0c

Question 16

What is Concave Mirror?
Convex Mirror?

Answer 16

Concave MIRROR: Converging
Convex MIRROR: Diverging (scary)

Question 17

What is Concave Lens?
Convex lens?

Answer 17

• Concave LENS: Diverging
• Convex LENS: Converging ( X )

Question 18

How to draw images?

Answer 18

• Straight Line then reflect through F
• Through F then reflect into straight line
• Line to C

Question 19

Image Characteristics

Answer 19

• Far: Small
• On: Same size
• Close: Larger
• On F: Nothing
• Past F: Larger, Upright, Virtual

Question 20

Real Images are?
Virtual Images are?

Answer 20

• Real is inverted
• Virtual is upright

Question 21

+-d, f, h/mag

Answer 21

d = RV
f = Con/Div
h/mag = Up/Inv

Question 22

Whats diffraction and how to maximize it?

Answer 22

Diffraction is bending.

1. Long wavelength
2. Small Opening

Question 23

What is double slit experiment?

Answer 23

• Really showed that light is a wave
• Two slits
• Constructive interference make light

Question 24

Equation for double slit experiment

Answer 24

£ = dsin0 / n
tan0 = x/L

d = SLITS
x = DISTANCE OF MAXIMAS
L = DISTANCE FROM SCREEN

rpm = 60/amt

Question 25

Dispersion stuff

Answer 25

- RuRoL : Red Refracts Least -DoVeS : Violet Diffracts Small

Question 26

Polarization of Light

Answer 26

- Scattered Light - Horizontal Polarizer = Horizontal Rays - Vertical Polarizer = Cancels out