The most important property of a star which determines its evolution is its
A) chemical composition
B) surface temperature
C) mass
D) radius
C
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The nucleus of lead-208, 
, has 82 protons within a sphere of radius 6.34 × 10?15. Each electric charge has a value of 1.60 × 10?19 C. Assuming that the protons create a spherically symmetric distribution of charge, calculate the electric field at the surface of the nucleus.
What will be an ideal response?
Two large, flat, horizontally oriented plates are parallel to each other, a distance d apart. Half-way between the two plates the electric field field has a magnitude E
If the separation of the plates is reduced to d/2 what is the magnitude of the electric field half-way between the plates? A) 4E B) E/2 C) 0 D) 2E E) E
Fusion employs the lightest nuclei because
A. fusion produces a nucleus whose binding energy per nucleon is smaller than that of the two parent nuclei. B. they are more plentifully available. C. they are easier to completely ionize and thus cause their nuclei to coalesce. D. fusion produces a nucleus whose binding energy per nucleon is larger than that of the two parent nuclei.
A beam of light that is parallel to the principal axis is incident on a concave mirror. What happens to the reflected beam of light?
A) It also is parallel to the principal axis. B) It is perpendicular to the principal axis. C) It passes through the center of curvature of the mirror. D) It passes through the focal point of the mirror. E) It passes between the focal point and the center of curvature of the mirror.