Week 5 (10/16) – Quiz #11 Which of the following statements is FALSE: A.Wien’s law states that the temperature of a black body and the wavelength of peak radiation bear an inverse relation to each other B.The luminosity of a black body is proportional to its temperature raised to the fourth power C.Atoms are capable of absorbing and re-emitting photons D.The energy of a photon is given by the formula: E = mc 2

Week 5 (10/16) – Quiz #12 Which of the following statements most accurately describes what happens when I HOLD A PIECE OF CHALK IN MY HAND: A.A gravitational force and an electromagnetic force are canceling each other B.Only a gravitational force is acting on the piece of chalk C.Only an electromagnetic force is acting on the piece of chalk D.A gravitational force and a strong nuclear force are canceling each other

Week 5 (10/16) – Quiz #13 Which of the following statements comparing our Sun to another star X located at the outer edge of the Milky Way galaxy is TRUE: A.They have the same orbital period around the center of our Galaxy B.Star X takes a longer time than the Sun to orbit the Galaxy’s center C.The Sun takes a longer time than Star X to orbit the Galaxy’s center D.Star X and the Sun are at the same distance from the center of the Milky Way

Week 5 (10/18) – Quiz #14 Two stars A and B have the same luminosity, but B appears to be 4 times brighter than A. Which of the following statements must be TRUE? A.Stars A and B have the same temperature B.Star B is twice as large as star A C.Star B is twice as far away as star A D.Star A is twice as far away as star B

Week 5 (10/18) – Quiz #15 Which of the following statements is FALSE? A.Elliptical galaxies are classified E0 to E7 in order of increasing ellipticity (i.e. increasing degree of flattening) B.An SBc spiral galaxy and an Sbc spiral galaxy have different bulge-to-disk ratios C.Irregular galaxies are a sub-class of disk galaxies D.An SBd galaxy’s spiral arms are more tightly wound (i.e. more closed) than an Sab galaxy’s spiral arms