Opacity is
a. the balance between the pressure and force of gravity inside a star.
b. the force that binds protons and neutrons together to form a nucleus.
c. the force that binds an electron to the nucleus in an atom.
d. a measure of the resistance to the flow of radiation (photons) through a gas.
e. the temperature and density at which a gas will undergo thermonuclear fusion.
D
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Isolated quarks were first observed in
A. 1938. B. 1955. C. 1976. D. 2001. E. Isolated quarks have not been observed.
To operate properly, superconductors must be kept below a critical temperature. The highest critical temperature for currently available superconductors is about
A. 10 K. B. 300 K. C. 200 K. D. 100 K. E. 25 K.
Which of the following microscopes is not capable of resolving individual atoms?
(a) An SEM operating at 30 kV (b) A TEM operating at 200 kV (c) An STM (d) An AFM
Potential: As an electron moves in the direction the electric field lines
A. it is moving from low potential to high potential and gaining electric potential energy. B. it is moving from low potential to high potential and losing electric potential energy. C. it is moving from high potential to low potential and gaining electric potential energy. D. it is moving from high potential to low potential and losing electric potential energy. E. both its electric potential and electric potential energy remain constant.