Light Waves

Question 1

Def of electromagnetic waves

Answer 1

Light, is a form of energy that does not need a medium to travel through

Question 2

Radio waves

Answer 2

Satellite radio, traditional T.V., phones, wireless networks etc.
-used to change into sound

Question 3

Microwaves

Answer 3

Wireless networks, cell phone towers, microwave ovens, weather radar, radio astronomy
-Electrical to light

Question 4

Infrared

Answer 4

Heat lamps, thermography, night vision googles, short range communications
-Associated with heat (not visible)

Question 5

Visible

Answer 5

Finger prints
-(low energy) red, orange, yellow, green, blue, violet (high energy)
-what we can see

Question 6

Ultraviolet

Answer 6

Pest control, vitamin D, fluoresce, forensics, sterilization

Question 7

X-rays

Answer 7

Medicine, x-ray astronomy
-Radiation

Question 8

Gamma rays

Answer 8

Medicine, gamma ray astronomy, security
-Lasers

Question 9

List the waves of light from LOWEST to HIGHEST

Answer 9

Radical
Martians
Invaded
Venus
Using
X ray
Guns

Question 10

Non-Ionizing

Answer 10

Light giving off (visible)
-Radio
-Microwave
-IR
-Visibke
Can repair if harmed (safe)

Question 11

Ionizing

Answer 11

Dangerous
-Can’t repair
-UV
-X rays
-Gamma rays

Question 12

Newtons theory on light

Answer 12

Light is a Particle
-It can reflect and refract
—But waves can also reflect and refract

Question 13

Young’s theory

Answer 13

Light is a wave
-It can interfere (constructive and destructive)
-Light diffracts(rainbow smeres)
-Particle CANNOT interfere

Question 14

Fresnel

Answer 14

Light is a wave
-air can diffract
-Particles CANNOT diffract

Question 15

Malus

Answer 15

Light is a wave
-can be polarized

Question 16

Einstein

Answer 16

Light is a particle
-It can knock electrons out of atoms
-Photoelectric effect —> the more energy = ripping electrons away (ultra violet)
-Waves make electrons move

Question 17

Mid 1900s theory

Answer 17

Light is a particle and a wave
-Particles CAN interfere

Question 18

Interference

Answer 18

Multiple waves interacting with one another
EX = CDs and DVDs

Question 19

Polarization

Answer 19

Blocks waves (transverse) that aren’t vibrant in up & down
EX = the black magic squares rotating them at a 90 degree angle

Question 20

Refraction

Answer 20

the change in direction of a wave passing from one medium to another caused by its change in speed

Question 21

Reflection

Answer 21

When the waves bounce off a surface or object and does not absorb the radiation

Question 22

Diffraction

Answer 22

Bending around a barrier

Question 23

A Wave can be…(5)

Answer 23

Reflection
Refraction
Interference
Diffraction
Polarization
NOT PHOTOELECTRIC EFFECT

Question 24

A particle can be…(3)

Answer 24

Reflection
Refraction
Photoelectric

Question 25

Doppler effect

Answer 25

Color changes because of its speed -Blue/violet light = high frequency and shorter wavelength -Red light =low low frequency and longer wavelength

Question 26

Big Bang theory

Answer 26

how astronomers explain the way the universe began

Question 27

Doppler effect for everyday life

Answer 27

Speed check, speed cameras, doppler radar (if clouds are rotating—> tornado)

Question 28

What is the source of all electromagnetic waves?

Answer 28

Vibrating electrons

Question 29

Young’s double split experiment

Answer 29

light is passed through two slits and forms an interference pattern on a screen behind the slits

Question 30

Einsteins photoelectric effect

Answer 30

a phenomenon in which electrons are ejected from the surface of a metal when light is incident on it -Light has particle like activity

Question 31

When light is in a more dense medium it will… what will happen to the second medium?

Answer 31

It will bend AWAY from the normal line

Question 32

Less to more…

Answer 32

Bends toward

Question 33

More to less…

Answer 33

Does digress (away)