In the late 1990's, it was discovered from distances of ___________ in distant galaxies that the expansion of the Universe is ___________
a. Cepheid variables; accelerating
b. Cepheid variables; decelerating
c. supernovae; accelerating
d. supernovae; decelerating
c
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If two electrons are entangled, then
A) if one particle suddenly alters its wave packet, the other must also. B) both are part of a single matter wave. C) Both of the above. D) they must exert forces on each other. E) All of the above.
If the sum total mass of reactants in a nuclear reaction is less than that of product particles, then which of the following statements best describes the conditions of the reaction?
a. reaction releases energy b. reaction absorbs energy c. atomic number of each reactant must be less than 80 d. atomic number of each reactant must be greater than 40
Uniform Electric Fields: A region of space contains a uniform electric field, directed toward the right, as shown in the figure. Which statement about this situation is correct?
A. The potential at all three locations is the same. B. The potentials at points A and B are equal, and the potential at point C is higher than the potential at point A. C. The potential at points A and B are equal, and the potential at point C is lower than the potential at point A. D. The potential at point A is the highest, the potential at point B is the second highest, and the potential at point C is the lowest.
According to Heisenberg, as the uncertainty in the measurement of a particle's momentum is reduced by a factor of 2, by what factor is the uncertainty in that same particle's position changed?
a. 1/2 b. 1 c. 2 d. 4