Radioactive decay is involved in
a. irradiating food to destroy harmful bacteria.
b. keeping the interior of the Earth hot.
c. making smoke detectors work.
d. finding flaws in jet engine parts.
e. all of the above.
e
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At what two celestial locations do the celestial equator and ecliptic coincide?
a. winter solstice and summer solstice b. vernal equinox and autumnal equinox c. They coincide at all points because they are the same. d. north celestial pole and south celestial pole e. zenith and east point
What process is illustrated in this diagram?
A) the annihilation of a particle and its antiparticle to make two photons B) the creation of two photons from pure energy C) the formation of an atom with a positive nucleus and a negative electron D) the evaporation of a black hole
Which of the following statements is false?
a. Sills are discordant rock bodies. b. Sills are formed from magma. c. Sills are tabular in shape. d. Sills consist of intrusive igneous rock.
Black holes
A) are holes in space, devoid of matter. B) cannot be detected in binary star systems. C) are the collapsed remnant of stars. D) are predicted by Einstein's special theory of relativity.