What happens during the apparent retrograde motion of a planet?
a) The planet appears to move westward with respect to the stars over a period of many nights
b) the planet moves backward through the sky over the course of a night
c)the planet moves through constellations that are not part of the zodiac
a) The planet appears to move westward with respect to the stars over a period of many nights
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How small an object can a scanning tunneling microscope "see?"
a. about the size of a mushroom spore b. about the size of a living cell c. as small as a single atom d. as small as the nucleus of an atom
More massive stars are _________ luminous and __________ than less massive stars, thus they pulsate _____________
a. less, smaller, faster b. more, larger, slower c. more, larger, slower d. less, smaller, faster
What causes the sun to "bob" up-and-down in its orbit around the galactic center?
A) gravitational attraction towards other nearby galaxies B) the localized pull of stars within the disk itself C) lack of friction with the low-density interstellar medium D) A and B E) B and C
What slit separation would a grating have to produce a first-order maximum at an angle of 
for a wavelength of 589 nm?
A. 109 nm B. 690 nm C. 378 nm D. 458 nm E. 916 nm