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Planetary Astronomy Unit 2 Key Terms
Key Terms and Matching Definitions
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adaptive optics
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CCD
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continuous spectrum
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diffraction grating
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electromagnetic
radiation
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emission line spectrum
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energy levels
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eyepiece lens
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focal length
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gamma ray
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helium
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infrared radiation
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Isaac Newton
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pixel
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ROY G. BIV
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reflection
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refraction
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speed of any wave
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spectroscope
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ultraviolet
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wavelength
1. The most energetic form of electromagnetic radiation.
2. Short for "picture element" and is one square in a grid of light sensing
elements.
3. A spectrum that contains only bright emission lines.
4. The distance from a lens or mirror to where the converging light rays
meet.
5. Hotter stars emit more of this wavelength.
6. Wavelength times its frequency.
7. The bending of light rays as they pass from a medium of one index of
refraction to a medium with another.
8. A telescopes optical system that is continuously and automatically adjusted
to compensate for the distortion caused by the Earth’s atmosphere.
9. The distance between any two successive wave crests.
10. A device used to create and view a spectrum.
11. A magnifying lens used to view the image produced at the focus of a
telescope.
12. The rebounding of light rays off a smooth surface.
13. Semiconductor chip that has replaced the photographic plate for
recording astronomical images on a telescope. Also known as charge coupled
device.
14. A form of energy that consists of oscillating electric and magnetic fields
that travels through space at the speed of light.
15. The acronym used to remember the order of the colors in the visible
spectrum (Red Orange Yellow Green Blue Indigo Violet)
16. The first person who systematically studied how white light can be broken
up into its colors using a prism.
17. A spectrum of light over a range of wavelengths without any spectral lines.
18. An optical device consisting of closely spaced lines on a piece of glass or
plastic used to disperse light into a spectrum.
19. The discrete energy values an electron can have within an atom.
20. Element that was first identified in the spectrum of the Sun.
21. Electromagnetic radiation with a wavelength longer than visible light, but shorter than radio waves, that we feel
as heat.