The atomic mass number of a nucleus is equivalent to which of the following numbers?
a. sum of neutron and proton numbers
b. number of neutrons present
c. number of protons present
d. difference in neutron and proton numbers
A
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When particles in the solar nebula grew large enough, they stopped growing by accretion and began growing by condensation
Indicate whether the statement is true or false
The A in AM radio stands for
A) acceleration. B) authorized. C) amplitude. D) agony. E) almost.
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
In 1974, a radio message was sent out from the Arecibo observatory in Puerto Rico. How far has it gotten, approximately?
A) just beyond our Solar System B) not even to the nearest stars C) just a miniscule fraction of the distance across the Milky Way D) almost to the center of the Milky Way E) beyond the Milky Way, to the Andromeda galaxy