light and the electromagnetic spectrum Flashcards
where is the incident angle located?
the angle that is entering the ray
where is the reflected angle located?
the angle which is exiting the ray
what do all the colours together make up?
they make up white light
each colour has a certain __ in visible light?
each colour has a certain wavelength in visible light
what happens to objects with certain colours?
the certain colour is reflected and all the other colours are absorbed
what is a concave lens and what is it used for?
shaped like a cave, corrects short sightedness, produces virtual image
what is a convex lens and what is it used for?
shaped like an eye, corrects long sightedness, creates a real image
what do electromagnetic waves transfer?
they transfer energy
what type of waves are electromagnetic waves?
they are transverse waves
what is the order of the electromagnetic spectrum?
- radiowave
- microwave
- infrared
- visible light
- ultraviolet
- xray
- gamma ray
from radiowave to gamma ray what happens to the frequency and wavelength?
radiowave: low frequency, long wavelength
gamma ray: high frequency, short wavelength
the higher the temperature, the more ___ and more ___ will be emitted
the higher the temperature, the more intense and more wavelengths will be emitted
what are the dangers of these?
- microwaves
- infrared
- ultraviolet
- xray/gamma
microwaves: internal heating of body cells
infrared: skin burns
ultraviolet: damage cells and eyes causing skin cancer
xray/gamma: mutation or damage to cells in body
what are the uses of the EM spectrum?
- radiowaves:
- microwaves:
- infrared:
- visible light:
- xray:
- gamma:
- radiowaves: communication, satellites
- microwaves: cooking, communication
- infrared: thermal imaging, cooking
- visible light: photography, vision
- xray: airport scanners, medical scanners
- gamma: sterilise medical equipment, treat cancer
