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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The intensity of unpolarized light passing through a single sheet of polarizing material changes by a factor of:
a. 0.5. c. cos2 q. b. 1. d. cos q.
Seismic waves are most useful for mapping
A) the surface of Mars with Global Surveyor. B) the surface of Venus with Magellan. C) the Earth's core and mantle. D) the depths of the oceans. E) the density of the hydrosphere.
What is the intensity level of a sound with intensity 10-3 W/m2?
A) 96 dB B) 30 dB C) 79 dB D) 90 dB E) 60 dB
Where did the Big Bang occur?
What will be an ideal response?