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

Physics & Space Science

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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.

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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)

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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

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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

Physics & Space Science