The speed of light in the void between molecules in glass is
A) more than its speed in a vacuum.
B) the same as its speed in a vacuum.
C) less than its speed in a vacuum.
Answer: B
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One of the reasons that Kapteyn underestimated the size of the Milky Way and Shapley overestimated it is that they did not recognize the ________.
A. dimming effect of interstellar dust B. age of the globular clusters C. effects of the motion of the Sun from the center D. existence of dark matter
A magnetic field exerts a force on an electric charge if the charge is
a. positive. b. negative. c. moving. d. stationary. e. any of the above.
Atoms in crystals are typically separated by distances of 0.10 nm
What kinetic energy must a nonrelativistic electron have, in electron-volts, in order to have a wavelength of 0.10 nm? (melectron = 9.11 × 10-31 kg, 1 eV = 1.60 × 10-19 J, h = 6.626 × 10-34 J ? s)
If a proton has a kinetic energy of 1.000 GeV, what is its speed? 
A. 0.935 c B. 0.875 c C. 0.766 c D. 0.586 c E. 0.343 c