Chapter 3 Astronomy HSU – Flashcards
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1 nanometer (nm) is
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10-9m
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A Newtonian telescope consists of the following types of mirrors:
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one concave and one flat mirror
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a___________ is a device that separates the light from stars and other objects according to wavelength in order to produce a spectrum
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spectrograph
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A recorder is part of a radio telescope
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true
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Chromatic aberration occurs in a refracting telescope when
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the different colors of light do not all come to the same focal point
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How is a Cassegrain reflecting telescope constructed?
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A concave primary mirror and convex secondary mirror that reflects light back through a hole in the primary mirror
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In a telescope, to what does the term "aberration" refer?
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A defect in design that blurs or distorts the image
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Modern astronomy would be possible without extensive use of computers
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true
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Neutrinos are important to our understanding of the early Universe.
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True
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One major difference between radio waves and light is that
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radio waves have lower frequencies than light waves.
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Radio waves travel through space at what speed?
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At the speed of light, 3 × 108 m/s
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Schmidt telescopes are used mostly for
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photographing wide areas of the night sky.
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The Earth's atmosphere is transparent to which of the following types of electromagnetic radiation?
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Radio waves
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The IRAS satellite, placed in orbit in 1983 to survey the whole sky, detected which kind of electromagnetic radiation?
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Infrared
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The speed of light in space is
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3 × 108 meters per second, independent of the speed of the source.
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Violet light differs from red light in that
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violet light has a shorter wavelength than red light.
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What are the basic parts of a Schmidt telescope?
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A spherical, concave primary mirror and a glass corrector plate.
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What is the main reason for using several radio telescopes together as an interferometer?
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To obtain much better angular resolution (sharpness) of the images
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What is the relationship between color and wavelength for light?
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Wavelength increases from violet to red.
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Which of the following is an electromagnetic wave?
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Microwave
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Which of the following types of electromagnetic radiation has the shortest wavelength?
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Gamma rays
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Which type of telescope uses a lens as the main optical element?
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A refracting telescope
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Who first showed that light does not travel at infinite speed?
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Ole Roemer in 1675
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Who was the first person to suggest that light is an electromagnetic wave?
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James Clerk Maxwell
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Who was the first astronomer to build and use a telescope to observe the night sky?
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Galileo
