1 ASTRonomy 302 Examination #1 Fall 2011 ANSWERS I understand that this examination period goes from 1:30 PM through 2:45 PM, and that I may be required to stay in my seat for the entire period of time. Also, I have not received, nor given any aid, nor assistance, nor answers, nor questions to anyone else during this examination period. I understand that any violation of the GMU honor code will result in my being reported directly to the honor committee, without warning. I understand that any honor code violation can cause me to fail the course, be suspended, and/or be expelled from the university; and, it will automatically be entered into my official records. Name: _____________________ Print _____________________ Signature _____________________ Student ID _____________________ Date 1 The period of a planet revolving around the Sun can be found if we know its *A average distance from the Sun B density C mass D period of rotation E More than one of the above is needed. 2 At what latitude on Earth is the North Celestial Pole at your horizon? A the Arctic Circle *B the equator C the North Pole D the South Pole E there are many latitudes where this occurs 3 Galileo's observations of the phases of Venus helped convince him that A the Moon goes around the Earth B the Sun goes around the Earth C Venus goes around the Earth *D Venus goes around the Sun E Ptolemy's model of the solar system was correct 4 The angular measure of an object in the sky clockwise from the North, is called its *A azimuth B altitude C declination D latitude E right ascension 5 The angular distance of an object in the sky above or below the Celestial Equator is called its A azimuth B altitude *C declination D latitude E right ascension2 6 The ecliptic may be considered as A the line passing from north to south directly overhead B the orbit of the Moon C the path of a star in the sky D the path of the Earth's north pole in the sky *E the apparent path of the Sun in the sky 7 Which of the following statements about the Copernican solar system model is CORRECT? A it did away with the need for epicycles B it was the first time ever that the Sun was considered at the center of the solar system C it provided a physical explanation of why the planets moved D it utilized elliptical motion *E None of the above is correct. 8 Suppose you are a space shuttle astronaut taking a space walk. Your tether breaks and the jets on your backpack are out of fuel. How can you get back to the shuttle alive? A flap your arms B lean closer to the center of mass *C throw your backpack directly away from the shuttle D wait for gravity to pull you and the shuttle together E start spinning yourself 9 If the Earth's axis were not tilted with respect to its orbital plane, then A a mean solar day would be longer B a sidereal day would be longer C the tides would be much stronger *D there would be virtually no seasons E the period of revolution and rotation would be equal 10 What is the phase of the Moon at point 7 in the diagram? A first quarter B full *C new D third quarter E waning crescent 11 Tycho Brahe's main contribution to astronomy was his A calculation of the orbits of the planets B model of the solar system *C observations of the planets' positions D textbook on the solar system and its origin E collection of anecdotes about Galileo3 12 Polaris is an important star because A it can sometimes be seen during the day B it displays retrograde motion *C it is very near the North Celestial Pole D it marks the vernal equinox E its position in the sky indicates the season 13 Ptolemy is best remembered for *A developing the geocentric solar system model B proving the Earth is spherical C showing that the orbits of the planets are ellipses D observing the positions of the planets E developing the heliocentric solar system model 14 Based on Newton's first law, if a body is moving in a curved path, then A it is being controlled by gravity *B there is a force acting on it C there is no equal and opposite reaction D there is no force acting E the body's position cannot be determined precisely 15 Which of the following groups have electromagnetic wavelengths, all of which are longer than visible light: A ultraviolet, microwave, radio B ultraviolet, x-ray, gamma ray *C infrared, microwave, radio D all of the above have wavelengths shorter than visible light E none of the above have wavelengths with all shorter than visible light 16 Which of the following groups have electromagnetic wavelengths, all of which are shorter than visible light: A ultraviolet, microwave, radio *B ultraviolet, x-ray, gamma ray C infrared, microwave, radio D all of the above have wavelengths shorter than visible light E none of the above have wavelengths with all shorter than visible light 17 Which of the following have photons of the highest energies: A 10 Watt microwaves B 10 Watt red light *C 10 Watt blue light D 100 Watt red light E 100 Watt green light 18 The Stefan-Boltzmann Law relates which two properties of an object? A temperature and velocity B temperature and peak wavelength *C temperature and energy radiated D focus and wavelength E Doppler shift and wavelength 19 Wien's Law relates which two properties of an object? A temperature and velocity *B temperature and peak wavelength C temperature and energy radiated D focus and wavelength E Doppler shift and wavelength4 20 If you turn up the temperature of a thermostat from 300 Kelvin to 600 Kelvin, how much more energy will be required to heat the chamber? A 64 times B 256 times C 4 times D 81 times *E 16 times 21 If you apply a high voltage across electrodes in a chamber of hydrogen, the type of spectrum you will see in a spectroscope looking at the gas is: *A an emission spectrum B an absorption spectrum C a continuous spectrum D all of the above spectra E none of the above spectra 22 If you allow sunlight to pass through a high resolution spectrograph you will see A an emission spectrum *B an absorption spectrum C a continuous spectrum D all of the above spectra E none of the above spectra 23 You take an object and move it twice the distance that it was from a light source. The amount of light that the object will now receive from the source is A twice as much as it did originally B one-third (1/3) times as much as it did originally C one-half (1/2) as much as it did originally *D one-quarter
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