Astronomy 101 Exam 1 review
Astronomy 101 Exam 1 review ASTR 101
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This 2 page Study Guide was uploaded by Breanab on Sunday January 31, 2016. The Study Guide belongs to ASTR 101 at University of New Mexico taught by Trace Tessier in Spring 2016. Since its upload, it has received 73 views. For similar materials see Introduction to Astronomy in Astronomy at University of New Mexico.
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Date Created: 01/31/16
Test one review Forty questions on the test, multiple choice, 100 points Know definitions to bold terms in the book Know review questions Understand the difference between the solar and sidereal day • Solar day is how long it takes for the sun to return to the same position in the sky, taking 24 hours. Its longer because its at a slightly different angle and because of the orbit • The sidereal day is how long it takes for the earth to rotate 230 degrees on its axis, taking 3.9 minutes less than the solar day. 23 hours and 56 minutes Understand c=wavelength times frequency • Where the wavelength decreases an amount and the frequency has to increase that amount to always equal c Understand acceleration=force/mass • Fixed Mass means more inertia, its resistance to change, when the force changes. Acceleration is the affect Black body spectrum • Shape in the spectrum • When the object becomes hotter, the intensity will increase and the peak will shift to higher frequencies to connect the shift in temperature where T is related to the frequency to the fourth power Why does the earth have seasons • Earths tilt in axis of rotation in respect to the plane gives rise to the seasons o Summer- more tilted towards the sun, earth is farther away o Winter-more tilted away from the sun, earth is closer • How is this related to how high the rises in the sky in the summer and winter? o The tilt provides more or less sun exposure What motion of the earth acts to slowly change the orientation of the earths axis of rotation? • Precession How long does one cycle of this motion take? • About 26 thousand years Parallax method to find distance of an object • How does the parallax angle vary with the distance to the foreground abject? o Depends on the distance of the baseline o Decreases with distance to the foreground object o Increases with the length of the baseline • How does the parallax angle vary with the length of the baseline? o ^^^^ decreases with distance, increases with length of base line The moon during what phases can a lunar eclipse occur? • During the full moon During what phase can a solar eclipse occur? • During the new moon How do the angular diameters of the moon and the sun compare and how do we know? • Geocentric vs heliocentric models The geocentric model explained by the retrograde motion of the planets by introducing epicycle The geocentric model was finally abandoned because it was unable to explain the observed phases of Venus Heliocentric model easily accounts for phases of venus with the sun in the center of everything Keplers laws Orbits are ellipses with the sun at one focus Planets speed up as it gets closer to the sun Orbital period increases rapidly with distance (the farther the planet the longer the orbit period) Newtons laws Categorize objects as Inertia an object in rest or moving in a uniform manner with stay in rest or in uniform unless acted upon Force equals mass times gravity Equal and opposite action-reaction Gravity- masses and range determine the strength What two competing effects lead to the stability of a planetary orbit?
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