The lowest energy level of a hydrogen atom (n = 1) is called
a. the ground state.
b. the potential state.
c. the ionization state.
d. none of these.
a
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Why have very few planets with low mass (comparable to Mars or Mercury) been found?
A) These small planets are very rare. B) Low mass planets do not produce large enough radial velocity changes in their stars. C) High mass planets are blocking our views of low mass planets. D) Hot Jupiters have ejected most low mass planets from their solar systems. E) Low mass planets are too far from their parent stars to receive enough light to make them visible from Earth.
A heavy man and a light man parachute together from a high-flying plane. The first to attain zero acceleration will be the
1) light man 2) heavy man 3) both will attain zero acceleration at the same time. because 4) the gravitational force on each man is the same. 5) of the lesser gravitational force acting on the lighter man. 6) air resistance will eventually counterbalance the weights of both men. 7) the lighter man will not have to fall for as long a time before air resistance equals his weight.
The moons of Mars are believed to be
a. composed primarily of iron and nickel. b. composed primarily of frozen gases of water and carbon dioxide. c. orbiting Mars in a direction opposite to the direction that Mars rotates. d. formed from material ejected from Olympus Mons and other large volcanoes on Mars. e. captured asteroids.
The modern-day organisms that seem oldest, in an evolutionary sense, are microbes that
live in the hot water around volcanic vents on the ocean floor. Indicate whether the statement is true or false