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m&m 2.1

Instruments of Astronomy

QuestionAnswer
Visible spectrum The color sequence of white light. Red orange, yellow, green, blue, violet
Wave A rhythmic movement, transferring energy from one place to another
Oscillation A back and forth motion that repeatedly follows the same path
Electromagnetic wave A electric field and a magnetic field that oscillate at right angles to each other
186,000 miles per second The speed that light travels in a vacuum
Frequency How fast the wave oscillates
Wavelength The length of one complete cycle
Electromagnetic spectrum All forms of electromagnetic radiation, when arranged according to wave length and frequency
Max Planck Provided current explanation of light
Quantum theory The theory that light exists as packets of energy called photons
Photons Packets of energy that contains light
Telescope The most important instrument used by astronomers.
Refracting telescope Uses lenses to gather light and form an image
Reflecting telescope Uses lenses and mirrors to produce an image
Focal point The point where light rays meet
Spectroscope A device that splits light into a spectrum for analysis
Spectrograph Photographic studies of the spectra produced by a spectroscope
Absorption lines Dark lines that show for frequencies that were absorbed when light is passed through gas and a prism
Radio telescopes Instruments that collect radio waves from space
Karl Jansky Discovered that static was caused by radio waves from space
Pulsars Stars producing rapid bursts of radio waves
Black hole A collapsed star so massive and dense that not even light is fast enough to escape from its surface
Hubble Space Telescope A telescope in space to "see" without any atmospheric interference
Created by: Jer Stephens
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