Pop-quiz #1 Which of the following statements is TRUE: Einstein first postulated the constancy of the speed of light with his general theory of relativity The equivalence of mass and energy is best expressed through the formula: E = mc2 Gravitational redshift is a feature of the special theory of relativity The principle of equivalence which equates gravity to an accelerated frame of reference is the basis of the special theory of relativity

Pop-quiz #2 Which of the following statements is FALSE: Wien’s law states that the temperature of a black body and the wavelength of peak radiation bear an inverse relation to each other The luminosity of a black body is proportional to its temperature raised to the fourth power Atoms are capable of absorbing and re-emitting photons The energy of a photon is given by the formula: E = mc2

Pop-quiz #3 Which of the following statements most accurately describes what happens when a star evolves from LEFT to RIGHT along a HORIZONTAL LINE in a HERTZSPRUNG-RUSSELL DIAGRAM: It’s temperature and radius both increase It’s temperature increases, but it’s radius decreases It’s temperature decreases, but it’s radius increases It’s temperature and radius both decrease

Pop-quiz #4 Which of the following statements most accurately describes what happens when I HOLD A PIECE OF CHALK IN MY HAND: A gravitational force and an electromagnetic force are canceling each other Only a gravitational force is acting on the piece of chalk Only an electromagnetic force is acting on the piece of chalk A gravitational force and a strong nuclear force are canceling each other

Pop-quiz #5 Which of the following statements comparing our Sun to another star X located at the outer edge of the Milky Way galaxy is TRUE: They have the same orbital period around the center of our Galaxy Star X takes a longer time than the Sun to orbit the Galaxy’s center The Sun takes a longer time than Star X to orbit the Galaxy’s center Star X and the Sun are at the same distance from the center of the Milky Way