Astronomy 03/18/15 – Flashcards
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What is the wavelength of the longest wavelength light visible to the human eye?
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700nm red light
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What is the wavelength of the shortest wavelength light visible to the human eye?
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400nm violet light
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Violet light has a wavelength of approximately
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400nm
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Has wavelengths that are longer than visible light
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infrared radiation
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There are ____ nanometers in 1 meter
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1x10^-9
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Has wavelengths shorter than visible light
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gamma rays and ultraviolet light
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Astronomers builds optical telescopes on top of the mountains because
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there is less air to dim the light and the seeing is better
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Has a few million light sensitive diodes in an array about half-inch square
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charge coupled device
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Radio telescopes have poor resolving power because
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radio waves have long wavelengths
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Ultraviolet radiation from a star
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will not penetrate earths atmosphere and reach the ground
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What are particles of light called
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photons
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Observations of radio waves from astronomical objects suffer from poor resolution invisible observations because
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the wavelength of radio waves is much longer
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Wien's law
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color is proportional to the temperature emitting it
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How do astronomers measure what stars are made of
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use a spectrum
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A new generation of telescopes is currently being built that overcomes the limitations of the older large Telescopes some of the new telescopes
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use segmented mirrors mirrors that are very thin active optics to control the shape of the mirror
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Radio telescopes are important and astronomy because
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they can detect cool hydrogen
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The ability of the telescope to resolve fine detail is known as the telescopes
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resolving power
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Infrared astronomy is often done from high flying aircraft because
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infrared radiation is absorbed low in Earth's atmosphere
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If an object spectral lines are shifted to longer wavelengths the object is
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moving away from you red shift
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How do you increase the light gathering power of a telescope
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bigger projector
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Is a piece of glass with many small parallel lines etched on its surface to produce a spectrum
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grating
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Uses a high-speed computer to monitor atmospheric distortion and adjust the optics of a telescope to partially compensate for the seeing
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adaptive optics
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The very long baseline interferometer
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radio telescopes linked together electronically to provide a very high resolution
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Are Subatomic particles traveling a tremendous velocities
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cosmic rays
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The ____ of a telescope is a measure of its ability to show fine detail and depends on the diameter of the objective
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resolving power
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Particles of lights
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photons
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Absolute zero is
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temperature at which Adams have no remaining energy from which we can extract heat
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The neutral hydrogen Atom consists of
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one proton and one electron
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The process of removing an electron from the stable nucleus is known as
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ionization
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A telescope that suffers from chromatic aberration and has a low like gathering power is most likely
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a small diameter refrccting telescope
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The lowest energy level in an atom is
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ground state
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The ___ of a gas is a measure of the average speed of the particles in the Gass
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temperature
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The part of the ident receives focus and light waves and sends it to the brain
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retina
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Colored part of the eye
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iris
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T/f light with the wavelength of 300 nm has a lower frequency been late with the wavelength of 500 nm
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false
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T/f The largest optical telescope ever constructed was a refracting telescope
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false
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T/f x-rays easily penetrate earths atmosphere and reach the ground from space
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false
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T/f light can behave as a particle or as a wave
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true
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T/f Reflecting telescopes are no longer popular with astronomers because they are expensive and suffer from chromatic aberration
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false
