what is light?

Question 1

what is light

Answer 1

electromagnetic wave
particle AND a wave
produced when electrons are “excited”

Question 2

properties of light

Answer 2

speed of light is 300,000 km/s
travels through a vacuum and does not need a medium
a form of electromagnetic energy
Light travels in straight lines
can be reflected, absorbed and/or refracted

Question 3

properties of waves
wavelength

Answer 3

the distance from one place in a wave to the next similar place on the wave

Question 4

properties of waves
amplitude

Answer 4

the wave height/depth from the rest position of the wave to the crest/trough
larger amplitude = more energy

Question 5

properties of waves
frequency

Answer 5

the rate of repitition of a wave (ex. cycles per second)
higher frequency = more energy

Question 6

electromagnetic spectrum

Answer 6

longer wavelengths result in lower energy
shorter wavelengths and more compact wavelengths, result in higher energy

Question 7

colour spectrum
ROY G BIV

Answer 7

Red, orange, yellow, green, blue, indigo, violet

Question 8

electromagnetic spectrum
Raymond’s Mother Is Visiting Uncle Xavier’s Garden

Answer 8

Radio waves
microwaves
infared radiation
visible light
uv light
x-rays
gamma rays

Question 9

radio waves

Answer 9

used in tvs, radios, and phones

Question 10

microwaves

Answer 10

microwave ovens, telecommunications, big bang theory (backgroun radiation)

Question 11

infared radiation

Answer 11

remote controls, light bulbs, heat detection, keeps food warm
visibility is difficult

Question 12

uv light

Answer 12

comes from the sun, can cause skin problems
creates vD and kills bacteria

Question 13

x-rays

Answer 13

used in x-rays, medical, security
used in cancer treatment bc of high energy and kills things
should not be exposed to all of your body because they are damaging and can cause mutations

Question 14

gamma rays

Answer 14

highest energy form
cancer treatments (radiation therapy), product of nuclear decay