Which of these is NOT true about the standard model of elementary particles currently accepted by most physicists?
a. It seems to explain every relevant experiment that can be done.
b. It combines two of the four basic forces into an "electroweak" interaction.
c. It combines the electroweak interaction with the color interaction.
d. It connects the color theory to the strong force.
e. It calls for mathematical calculations that are currently impossible.
c
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The primary mechanism for the absorption of infrared radiation is by excitation of:
(a) The core atom electrons (b) Atomic vibrations (c) The nucleus (d) Valence-band electrons
In the absence of a greenhouse effect, what would happen to Earth's oceans?
a. They would evaporate. b. They would freeze over. c. They would be rapidly absorbed into the surface rocks. d. They would dissociate into ozone and hydrogen.
If Saturn takes about 30 years to orbit the Sun, and its rings were seen edge-on in 1995, when did they next appear most open at solstice?
A) 2007 B) 2005 C) 1998 D) 2010 E) 2002
For this situation, I push on a heavy chair.Suppose I push moderately on the chair, and this time the chair does move. Then the strength of the force the chair exerts on me is
a. less than the force I exert on the chair. b. equal to the force I exert on the chair. c. greater than the force I exert on the chair. d. zero.