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level: Light and Energy

Questions and Answers List

level questions: Light and Energy

Question	Answer
Light hitting the surface of what type of gemstone is either reflected, absorbed or scattered?	Opaque
What type of gem materials do not scatter the light that is transmitted through it?	Transparent
What type of gem materials scatter the light that is transmitted through it?	Translucent
If a gem material absorbs or reflects light of varying wavelengths differentially, they display a colour determind by the nature of that __________ .	Absorption
The precise colour spectrum of what can vary depending on the source?	White light
The colour change effect we see in stones such as alexandrite occurs because of the different ______ _________ in certain types of light and how it interacts with the gem material.	Colour spectrum
What is the name of the small particles of energy that are the form taken by emitted or absorbed light and other electromagnetic energy?	Photons
What is the term used to describe the measurement of distance between repeating units of a propagating wave of a given frequency, that is measured in nanometres?	Wavelength
__________ is inversley proportional to wavelength, and is proportional to energy level. Their value is often inconveniently large, so wavelength is often quoted instead.	Frequency
What is the term used to describe the number of waves per unit length, often in cm?	Wave number
What is the name of the unit of measurement that directly indicates energy level?	Electron volt
What component of a gem material is energised by light or heat energy entering the stone?	Electron