Which of the following is a contribution that Galileo made to astronomy?
A. He discovered four moons (or satellites) of Jupiter.
B. He discovered epicycles.
C. He determined the size of Earth.
D. He developed the first successful heliocentric theory.
Answer: A
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Most terrestrial planets have portions of their surface that appear to be significantly older than other portions of their surface. What evidence suggests that the surface of Venus is all of the same age?
a. Photos taken by probes that landed on Venus showed that all of the rocks were of the same age. b. The craters on Venus are randomly distributed in size and number across the surface. c. The volcanoes on Venus are not found in isolated groups, but are scattered around the planet. d. a and b e. all of the above
Galileo found the rotation period of the Sun was approximately
A) a day. B) a week. C) a month. D) three months. E) a year.
A metal having a work function of 2.4 eV is illuminated with monochromatic light whose photon energy is 4.0 eV. What is the maximum kinetic energy of the photoelectrons produced by this light? (h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
A) 5.5 × 10-19 J B) 2.6 × 10-19 J C) 3.8 × 10-19 J D) 4.7 × 10-19 J E) 6.4 × 10-19 J
The lunar maria are ancient _______________ that have apparently covered older, cratered lowlands
Fill in the blank(s) with correct word