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level: Light Energy and Waves

Questions and Answers List

Question	Answer
What is the name of the direction taken by a single wave of light	Direction of Propagation
What is the name of the direction in which a wave of light vibrates?	Vibration Direction
When light travels through a gemstone, what causes it to slow down?	Electrons
When light hits a gemstone, some of the light may be reflected from where?	Surface
Light travels fastest and most easily through what?	A Vacuum
What happens to light within a gemstone to make the gem appear coloured, translucent or opaque?	Absorption
What are wavelengths of light measured in?	Nanometres
What is the term used to descibe the number of lightwaves that travel a certain distance per second?	Frequency
The frequency of wavelengths of light causes the eye and brain to interpret what in response?	Colour
The brightness and intensity of a light relates to what aspect of the wave?	Height
The human eye can detect wavelengths between what range of nanometres?	400 - 700
What is the range of light waves detectable by the human eyer referred to?	Visible Light Spectrum
A combination of all colours of the visible light spectrum produces what colour light?	White
What is the spectrum of all types of energy rays called?	Electromagnetic