Light + Wave

Question 1

what type of wave is light and what type of wave is sound

Answer 1

light = electromagnetic
sound = longitudinal - requires medium

Question 2

does light require a medium to travel

Answer 2

no therefore it can travel in a vacuum

Question 3

refractive index of air

Answer 3

1

Question 4

refractive index of water

Answer 4

1.3

Question 5

what happens when changing mediums

Answer 5

velocity changes but frequency doesn’t

Question 6

wavelength of red light

Answer 6

700nm or 750??

Question 7

wavelength of violet light

Answer 7

400nm

Question 8

electromagnetic spectrum from lowest energy highest wavelength to hight energy shortest wavelength

Answer 8

radio wave
microwave
infrared
visible
ultraviolet
xray
gamma ray

Question 9

what is the wave particle duality

Answer 9

light travels as a wave but interacts like a particle

Question 10

two equations from the energy of a photon

Answer 10

E = hf
E = hc/wavelength

Question 11

what is diffraction

Answer 11

how a waves bends when it encounters an obstacle

Question 12

a smaller gap for a wave to go through will result in a _____ diffraction

Answer 12

wider

Question 13

what is constructive interferance

Answer 13

waves will add when path length is a multiple of the wavelength

Question 14

what is destructive interference

Answer 14

waves cancel

Question 15

what is the angle of reflection in relation to the angle of incidence

Answer 15

angle of incidence = angle of reflection

**in reference to the normal perpendicular to the surface

Question 16

equation for refraction index

Answer 16

n = c/v

Question 17

why is n always >1

Answer 17

because light is fastest in a vacuum

Question 18

what happens to velocity as n increase

Answer 18

slows down

Question 19

what is dispersion

Answer 19

splitting of white light by a prism

Question 20

how does light disperse through a prism

Answer 20

violet (higher n and faster) bends more

red (slower lower n) bends less

Question 21

what is the cause of refraction

Answer 21

when going to different mediums of differing n the velocity of light changes causing a bend

Question 22

how will light bend going from low n air to high n water

Answer 22

towards the normal

Question 23

what is snells law what relationships can we get out of this

Answer 23

n1sin1 = n2sin2

if we are going to a higher n than the angle will have to be smaller

Question 24

what happens if light enters the air the water at an angle of 0

Answer 24

keeps going straight bc sin0 = 0 refraction

Question 25

what are the 2 requirements for total internal reflection

Answer 25

going from a high n to a low n (water to air) | large angle of incidence

Question 26

what happens to the angle of refraction when the critical angle is reached

Answer 26

it is 90 degrees

Question 27

what is the critical angle

Answer 27

angle of incidence when the angle of refraction is 90 so total internal reflection occurs **** be aware of questions if they are asking for the refraction or incidence angle

Question 28

what do you need to know about what electromagnetic means

Answer 28

light has both electric and magnetic components which are perpendicular to each other and perpendicular to velocity of the wave think of x y and z fields

Question 29

what is polarization

Answer 29

light is naturally in all different directions from each other when it goes through a polarizer it only lets light waves of a certain orientation through resulting in a uniform orientated light beam polarized sun glasses prevent glare

Question 30

what is circular polarized light

Answer 30

direction of the fields rotate steadily over time either clockwise or counterclockwise

Question 31

if something has high absorbance at 700nm what color would it be

Answer 31

not red because color is what is reflected

Question 32

relate to space about the difference between sound and light

Answer 32

light can travel through a vacuum which is why we can see | sound can't travel through a vacuum which is why you can't hear anything in space

Question 33

what is c

Answer 33

EM velocity in a vacuum speed of radio waves or light waves in a vacuum 3x10^8

Question 34

master wave equation

Answer 34

v = wavelength x frequency

Question 35

value of planks constant

Answer 35

6.64x10^-34 m^2kg/s

Question 36

what property of waves correlates with its energy

Answer 36

frequency!!

Question 37

if light travels from n = 2 to n =2 will there be a bend or refraction

Answer 37

no because no change in velocity

Question 38

to find the nth max in single vs double slit defraction which length is used

Answer 38

single slit is the length of the aperture | double is the distance between 2 aperture

Question 39

what is color of light dependent on

Answer 39

frequency