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level: The Electromagnetic spectrum

Questions and Answers List

Question	Answer
What are the four higher energy wavelengths outside of the visible light spectrum?	Ultraviolet
What are the three lower energy wavelengths outside of the visible light spectrum?	Infrared
What type of rays can be used to determine if a pearl is natural or cultured, or to alter the colour of certain gem materials?	X-Rays
What types of rays can be used to alter a gems appearance, but not for testing?	Gamma rays
What types of rays can be used to aid gem identification or detection by use of flouresence?	Ultraviolet
What types of rays are used in reflectance meters to aid gem identification, or in a spectrophotometer to measure absorption?	Infrared
Different types of electromagnetic waves how different powers of ____________ .	Penetration
What is the term used to describe the emission of visible light by a substance whilst it is being excited by radiation of higher energy and shorter wavelength?	Fluorescence
What substance can inhibit the luminescence seen in rubies?	Iron
What is the term used to describe a continued emission of radiation after the removal or a source of radiation?	Phosphorescence