Topics 6-7-8 Flashcards
Radio waves have:
a) Longest Wavelength
b) Shortest Wavelength
a)
Infrared Radiation is used in ________, ________, __________.
Motion sensors, heat lamps, Infrared cameras
Infrared Radiation is _________ radiation
Heat
What Does Ultra-Violet (UV) light do?
o Filtered by the ozone layer
o Causes tanning and burns
Gamma Rays are the ___________est wavelength
Shortest
What do Gamma Rays do?
o Result from nuclear reactions
o Used to treat cancer
o Gamma can kill living cells and damage tumors
Light is a type of energy that we can ___
See
Light can act as _______ and ________
Waves and particles
What is frequency and what is it measured in?
Frequency is the number of cycles completed in a certain amount of time. Measured in herts (Hz) or cycles per second.
What is the the formula for calculating frequency?
N
F = —- or #of vibrations divided by seconds
S
What does “L.A.S.E.R” stand for?
Light Amplification by Stimulated Emission of Radiation. Lasers emit bulbs with a single frequency. This is called coherent light.
White light is made of a spectrum of all colours. Why are objects coloured when we see them?
We see colour based on the light that is not absorbed by the object. Colours are reflected off an object and refracted into our eye.
If the colour white means that NO COLOUR IS ABSORBED, what happens when we see the colour black?
Black means all the colours are absorbed.
What are the additive primary colours?
The additive primary colours are red, green, and blue because when when added together, they create white light.
Why are colours different?
Visible light contains waves of different wavelengths and frequencies. Each colour of light has a different size wavelength.
