Bohr's model explains the absorption spectrum as the result of:
a. the specific jumps downward in energy that an electron has available in an unexcited atom.
b. the specific jumps downward in energy that an electron has available in an unexcited atom.
c. the specific jumps upward in energy that an electron has available in an unexcited atom.
d. the specific jumps upward in energy that an electron has available in an excited atom.
e. how an electron sometimes absorbs a photon when dropping to a lower level instead of emitting one.
c
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A future use of space stations may be to provide hospitals for severely burned persons. It is very painful for a badly burned person on Earth to lie in bed. In a space station, the effect of gravity can be reduced or even eliminated
How long should each rotation take for a doughnut-shaped hospital of 200-m radius so that persons on the outer perimeter would experience 1/10 the normal gravitational pull of Earth? A) 91 min B) 8.7 min C) 4.6 min D) 1.5 min E) 0.011 min
Coal power plants release particulates as well as other materials
What will be an ideal response?
The asymmetrical surface markings on some of Saturn's moons are probably due to:
A) all of the moons are located within the rings and they sweep up ring particles. B) the moons of Saturn are made primarily of ices. C) in most cases, the moons are tidally locked by Saturn's gravity into synchronous rotation. D) comet impacts become progressively harder as you get closer to Saturn. E) most of the moons show signs of ice volcanism driven by tidal interactions.
What is the temperature in kelvins of the visible surface of the Sun?
a. 600 K b. 6 million K c. 6 billion K d. 6000 K