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50 Cards in this Set
- Front
- Back
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An Electromagnetic wave has a wavelength of 80 cm. This wave is
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a Radio Wave
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The nightly motion of objects across our sky from horizon to horizon is caused by
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the rotation of the earth on its axis
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The constellation whos stars are used as pointers to the North Celestial pole in the Northern hemisphere at this time in history is
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Ursa Major , the Big Dipper
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The average distance from earth to the sun , 149,600,000 km. can be written in shorthand notation as
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1.496 X 10 ^8
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If the moon is located at the vernal eqinox on the first day of spring , what then is the phase of the moon
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New Moon
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What changes would you expect to see in the resulting spectrum of emmited light from a piece of metal when it is heated slowly in an intense flame from 500k to 1500k
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The intensity of radiation would increase greatly, and its color would change from red through white to blue
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What is the main reason for placing astronomical telescopes and detectors on satellites
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To get above the absorptionin the Earth's atmosphere
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How many electrons surround the nucleus of a neutral atom of iron, the 26th element in the periodic table
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26
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The Crab Nebula is the result of a supernova explosion of a star that occurred at a distance of about 6000ly from the Earth. If people first saw the explosion in the year 1054 A.S. about when did the explosion actually occur
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4946 B.C.
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Who first proved that light is a wave
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Thomas Young
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What would the position and motion of the Sun be on December 21 from the South Pole
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It would move completley around the sky in 24 hours while maintaining an angle of 23.5 degrees above the horizon
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The atomic number of the isotope 238U of uranium is 92. the nucleus of this isotope contains
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92 protons and 146 neutrons
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How do the nuclei of the isotopes 14C of carbon and 14N of nitrogen differ from each other.
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They have different numbers of both protons and neutrons
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The idea that light consists of of photons, bundles of pure energy, was first proposed by
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Romer
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The parameter of an atom that defines its unique position in the periodic table is
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The number of protons in the nucleus
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Jupiter will be at which configuration when it is at the middle of its retrograde motion
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Opposition
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The present-day calendar, which includes leap years and century year exclusion, was introduced by
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Pope Gregory XIII in 1582
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When in total lunar eclipse , the Moon shows a reddish color because
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Only the red part of the solar spectrum is deflected onto it by the Earth's atmosphere
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The first major astronomical prediction of Newton's theory of gravitation to be confirmed by observation was
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The return of Halley's comet
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The reason that the primary mirror of an astronomical telescope is often shaped an polished to a parabolic shape
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To avoid spherical aberration by bringing parallel rays to a single focus
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When an atom of the radioactive carbon isotope 14C decays into 14N (nitrogen), what happens in the nucleus of the atom?
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A Neutron becomes a proton
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In Ptolemy's geocentric theory of the solar system, what name is given to the small circle around which the planet moves while the center of this cirle orbits the Earth
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Epicycle
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The planets that were known before the telescope was invented were
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Saturn , Venus, Mars, Mercury, and Jupiter
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An inferior planet moves more or less directly toward the Earth at greatest eastern elongation. What does this mean when you are watching the night-by-night motion of this planet against the background stars
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The planet appears to remain stationary for a few days
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When visible light passes through a glass prism or a glass lens, which wavelength of light are deflected most by the glass
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The shorter wavelengths
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The direction of retrograde motion for a planet as seen by an observer on the Earth is
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From east to west relative to the background stars
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In general , doubling the diameter of an optical telescope will
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Quadruple the light-gathering power and double the angular resolution
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In winter, clocks in New York ( maintaining civil time, or mean solar time) compared to those in California will be
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3 Hours ahead
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If there are about 6000 stars in the entire sky that can be seen by the unaided light , about how many stars would be seen at a particular instant on a given dark night from a single location with an
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3000
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Are the constellations seasonal
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Yes, on a summer night many of the constellations you can see are different from those you can see on a winter night. Nut there are some constellations you can see all year long
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When a ray of light strikes a smooth mirror surface at an angle to the perpendicular , the ray is reflected
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On the "other" side of the perpendicular , but at the same angle as the incoming ray
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Two celestial coordinates, which together describe a stars position precisely in our sky, are
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Right ascension and Declination
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A high mountaintop such as Mauna Kea in Hawaii is a good site for an infrared observatory primaraly because it is
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Above a significant proportion of the moisture in the Earth's atmosphere
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The patteren of stars that is visible from one position on the Earth gradually shifts from East to West across the sky over one night. This is caused by
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The rotation of the Earth about its own North-South axis
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What will be the approximate value of the right ascentsion of the Sun this year on March 21
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0 hours 0 minutes
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The hubble space telescope, placed in orbit from the space shuttle in 1990, has a primary mirror of diameter
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2.4 m
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What is the ultimate test for a scientific theory or idea
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That it make predictions that are verifiable by observation or measurment
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The person who introduced the leap year into our calendar was
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Julius Ceaser
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The New Zealand physicist Lord Rutherford and his colleagues in England demonstrated the existance of the very small but massive nucleus inside every atom in which crucial experiment
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The deflection, and occasional reflection backward, of energetic nuclear particles from being a beam aimed at a thin metal sheet
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The lowest amount of solar energy per square meter is incident upon the surfae of Earth in the Northern Hemisphere on or about
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December 21st , the beginning of Winter
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A particular photon has a wavelength of 450nm and a second one has a wavelength of 580nm. What is true for the enrgies of these 2 photons
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The 450-nm photon has a higher energy
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If you face polaris , the North Star, you are facing north and
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East is to your right and west is to your left, whether you are in the northern hemisphere or not
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How long will it take, in solar time, for the Big Dipper, or Ursa Major to return to the same position in an observers sky
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23 hours and 56 minutes
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A given star will reach its highest point in the sky for a particular observer in the southern hemisphere when it passes through
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The region of the sky is due north
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Visible light occupies what position in the whole electromagnetic spectrum
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Between infrared and Ultraviolet
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Violet light differes from red light in that
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Violet light has a shorter wavelength than red light
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An accelerating body must at all times
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Have a changing velocity
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An astronomer finds a source of light in space that emits light only in specific , narrow emission lines. Kirchoff's laws lead him to what
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The source is made up of a hot, low-density gas
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An apparent EASTWARD motion of a planet from night to night compared to the background stars ( as viewed from the earth ) is referred to as
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Direct Motion
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Planets move past the background stars as seen by someone on the Earth. What is the normal direction of this Motion
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From West to east because of the motion of the planet along its orbit
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