Exam 2B - Binghamton University ASTR 114 | Latest 2023

This exam is entirely multiple choice or true/false. A=T, B=F TRUE/FALSE. Write 'T' if the statement is true and 'F' if the statement is false. 1) The photosphere is about 100 times the diameter of the Earth, and large sunspots are larger than our whole planet. 1) 2) Granulation is the most obvious proof of solar convective energy transport. 2) 3) The solar corona is much cooler than the Sun's surface, hence we must wait for a total solar eclipse to glimpse it with the naked eye. 3) 4) Energy from the core of the Sun first travels slowly through the convection zone and then much faster through the radiation zone. 4) 5) We know the Sun rotates differentially by observing sunspots; as with Jupiter the solar equator rotates the fastest. 5) 6) The Sun is a relatively young star, near the beginning of its life. 6) 7) In the proton-proton cycle, the product (He) have a lower combined mass than the inputs (Protons) 7) 8) The proper motion of a star is its true velocity through space. 8) 9) The proper motion of a star, its distance, and Doppler shift can give us its space velocity. 9) 10) First magnitude Spica appears 2.5 times brighter than second magnitude Polaris. 10) 11) Star A and star B have the same apparent magnitude. Star A is 10 times the distant as star B. Therefore, star A has 10 times the luminosity as star B. 11) 12) A type B9 star is hotter than a type A0. 12) 13) A star of the Sun's diameter, but half as hot, must be 1/16 times less luminous than the Sun. 13) 14) On the main sequence, almost all stars have radii between about 0.1 and 10 times the Sun. 14) 15) The Sun's complete classification is G2V. 15) 16) The more distant a star, the smaller its parallax. 16) 17) In a binary system, the less massive star always stays further from the center of mass and move faster. 17) 18) Two stars have the same spectral type. Star X is in luminosity class III, while Star Y is in luminosity class V. Therefore, Star X is larger in radius than Star Y. 18) 19) Two stars have the same luminosity. Star X is spectral type F, while Star Y is spectral type K. Therefore, Star X is larger in radius than Star Y. 19) 20) Two stars both lie on the main sequence. Star X is spectral type A, while Star Y is spectral type G. Therefore, Star X is more massive than Star Y. 20) MULTIPLE CHOICE. Choose the one alternative