Most of the mass of an atom is ____
a. in the electron cloud
b. spread evenly through the atom
c. made up of electrons
d. concentrated in the nucleus
e. concentrated in a disk around the nucleus
d
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Consider a raisin cake expanding uniformly in an oven. Viewed from one of the raisins, you would see
A) all other raisins moving away from you, with more distant raisins moving faster. B) all other raisins moving away from you, with more distant raisins moving slower. C) all other raisins moving away from you at the same speed. D) all raisins, including your own, growing in size as the cake expands.
Inward migration is a hypothesis used to explain why
A) Jupiter-sized planets are seen orbiting close to some stars B) some stars do not have Jupiter-sized planets C) some stars do not have planets at all D) Terrestrial-sized planets are seen orbiting far from some stars
The detectors on the Spitzer Space Telescope were cooled to near absolute zero in order to:
A) allow the electronics in these instruments to operate most efficiently. B) keep the telescope more nearly stationary. C) prevent the infrared radiation from the instruments interfering with the infrared signals from space. D) improve the angular resolution of the telescope.
Which reflector telescope would be the easiest to construct, and why?
What will be an ideal response?