The major processes that heat the interiors of the terrestrial worlds are
A) (1 ) Heat deposited as the planets were built from planetesimals; (2 ) heat of accretion; (3 ) heat that came from the gravitational potential energy of incoming planetesimals.
B) (1 ) Heat of accretion; (2 ) heat from convection; (3 ) heat from thermal radiation.
C) (1 ) Heat deposited as the planets were built from planetesimals; (2 ) heat deposited as the planets underwent differentiation; (3 ) heat released by radioactive decay.
D) (1 ) Volcanism; (2 ) tectonics; (3 ) erosion.
C
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Fermium-253 has a half-life of 3.00 days. A sample of fermium has 3.88 × 106 nuclei. What is the initial activity of this sample?
A) 10.4 kBq B) 12.9 kBq C) 12.9 Bq D) 10.4 Bq
About a thousand trillion neutrinos are passing through your body every second. Why don't they hurt you?
A) Neutrinos interact with ordinary matter only through the weak force. B) Their masses are too low to cause any damage. C) They are traveling too slowly to cause any damage. D) Our immune systems release antibodies that counteract the damage the neutrinos cause. E) Actually, they do—neutrinos are the cause of many cancers.
When a planet the size of Jupiter passes in front of a star the size of our Sun, the drop in the intensity is about _____ percent.
A. 1 B. 2 C. 3 D. 4
The wavelength of a radio wave from an AM station broadcasting at 1,000 kilohertz on your radio dial is __________
Fill in the blank(s) with correct word