The particle thought responsible for particle masses is
a. the graviton.
b. the gluon.
c. the ?– particle.
d. the Higgs boson.
d
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Light passes from medium one 
to medium two 
If v1< v2 then at the boundary
A. f increases 
decreases.
B. f does not change, 
increases.
C. f decreases, 
increases.
D. f does not change, 
decreases.
Suppose we imagine the Sun to be about the size of a grapefruit. Which of the following best describes the size and distance of Earth on the same scale?
A) Earth is the size of a tip of a ballpoint pen about 1 meter from the Sun. B) Earth is the size of a golf ball about 1 meter from the Sun. C) Earth is the size of a tip of a ballpoint pen about 15 meters from the Sun. D) Earth is the size of a golf ball about 15 meters from the Sun. E) Earth is the size of a marble about 25 miles from the Sun.
Higher energy photons have
A) greater speed. B) longer wavelengths. C) higher frequency. D) All of the above. E) None of the above.
What happens to the cyclotron frequency of a charged particle if the radius of its path doubles?
A) It quadruples. B) It triples. C) It doubles. D) It halves. E) It does not change.