#1

Question 1

Electromagnetic Waves def

Answer 1

Transvere waves consisting of a combination of oscillating electric & magnetic fields

Question 2

What are the origins of a force

Answer 2

Fields

Question 3

Speed of light in a vacuum

Answer 3

3 X 10^8 m/S

Or 186,000 miles/S

Question 4

Dual or nature def

Answer 4

Light can either be a wave or a particle (photon)

Question 5

EM Waves are different from mechanical waves in 2 ways?

Answer 5

1) EM is a comb of 2 waves - 1 cannot exist without the other
2) EM do not need a medium

Question 6

All parts of a transverse apply to

Answer 6

EM waves

Question 7

EM Spectrum

Answer 7

1) Radio, Micro, infrared, visible, ultraviolet, xray, 7) gamma rays

Low energy photon - High energy photon

Question 8

Radio def

Answer 8

< 100hz - 1x10^9 hz
Usually given in KHz or MHz
Used for communication
High frequency needed for space communication

Question 9

Commercial bond=

Answer 9

88-108 MHz

Question 10

Microwaves def

Answer 10

1x10^9 - 1x10^12

Question 11

Microwaves are used for what

Answer 11

1) Radar - microwaves
2) communication - Bluetooth, wifi
3) cooking - 2450 mHz, wavelength of 0.122m

Question 12

How do microwaves cook food

Answer 12

By raising energy of molecules directly

No convention or conduction

Question 13

Water molecules oscillate ?

Answer 13

Back and forth & increasing KE, increasing temp

Question 14

Infrared(IR)

Answer 14

1x10^12 - 4x10^14

Question 15

Everything emits

Answer 15

IR

Question 16

As atoms vibrate they

Answer 16

Release IR

Question 17

As cooler atoms absorb IR, they

Answer 17

Vibrate more

Question 18

What are infrared used for

Answer 18

Wireless control(TV, stereo, Xbox)
   Emit coded IR

Question 19

Visible light def

Answer 19

4x10^14-7.5x10^14
ROYGBV
44% of suns radiation is visible light

Question 20

Ultraviolet def

Answer 20

7.5x10^14-1x10^18

Question 21

7% of sun is

Answer 21

UV
Doesn’t heat as much as IR, but causes chemical reaction that tans skin
Can cause change to DNA

Question 22

Fluorescence def

Answer 22

When certain substances are hit with UV, they emit visible light

Question 23

Visible light def

Answer 23

Coat light with substance, excited atoms in tube produce UV, UV hits coating and it glows

Question 24

X-rays

Answer 24

1x10^18 - 1x10^20

Question 25

X-rays - wavelength is the same size as

Answer 25

Spaces between atoms in solids

- show how atoms are arranged

Question 26

Body materials absorb X-rays

Answer 26

Differently

Question 27

Materials with Ca absorb X-rays

Answer 27

Easily

Question 28

Materials with C, H & O

Answer 28

Don’t absorb X-rays

Question 29

Materials with very large atoms(lead=82)

Answer 29

Absorb X-rays very well

Question 30

Gamma rays

Answer 30

1x10^20-1x10^23

Question 31

Radioactive decay produces

Answer 31

Gamma rays

Question 32

Nuclear fission

Answer 32

Pull apart

Question 33

Nuclear fusion

Answer 33

Smash together

Question 34

White light is

Answer 34

A combo of equal amounts of all the colors

Question 35

Black color is the

Answer 35

Absence of light; lack of reflection

Question 36

Reflection did

Answer 36

All objects reflect light(excpect pure black)

Question 37

Two types of reflection

Answer 37

1) speculator reflection

2) diffuse reflection

Question 38

Speculate reflection def

Answer 38

Reflection off a smooth surface

Question 39

Low of reflection =

Answer 39

Qi=Qr

Question 40

Diffuse reflection def

Answer 40

Reflection off of a rough surface

Still follows law of reflection