Why is there a radioactive source in a smoke detector?
a. It makes the smoke particles radioactive.
b. It ionizes the air.
c. It powers the alarm when the battery wears out.
d. none of the above
B
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This photo, taken from orbit of Mars, shows a feature known as
A) Olympus Mons B) Valles Marineris C) Ishtar Terra D) Hellas Basin
The solar constant is a measure of
a. the amount of solar energy reaching Earth.
b. the length of the sunspot cycle.
c. the period of rotation of the Sun's equator.
d. the average number of sunspots seen during the Maunder minimum.
e. the Sun's mass.
A gallon container is filled with gasoline. How many gallons are lost if the temperature increases by 25°F? (The volume expansion of gasoline is 9.6 × 10?4 (°C)?1.) (Neglect the change in volume of the container.)
A. 2.4 × 10?2 B. 1.3 × 10?2 C. 3.6 × 10?2 D. 4.8 × 10?2 E. 9.6 × 10?2
The combining of two nuclei to form a larger nucleus with the release of energy is
a. nuclear fission. b. nuclear fusion. c. neutron activation. d. nuclear emission. e. beta decay.