Since ?0 = 8.85 × 10?12 C2 / N ? m2, the units of ?0E2 can be reduced to
A.
.B.
.C.
.D.
.E.
.Answer: C
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Suppose it turns out that one in 1 million stars has a planet that at some point in its history is home to an advanced civilization. Then the total number of civilizations that have arisen in our galaxy would be closest to
A) 4. B) 40. C) 400. D) 4,000. F) 40,000. E) 400,000.
A proton with mass 1.67 × 10^-27 kg moves in an accelerator with a speed of 0.600c. What is its total energy? (c = 3.00 × 10^8 m/s)
a. 3.26 × 10^-10 J c. 0.540 × 10^-10 J b. 1.88 × 10^-10 J d. 2.51 × 10^-10 J
Photon energies and wavelengths are _________related to each other.
Fill in the blank(s) with the appropriate word(s).
Approximately how long does it take the sun to go through a full cycle of passing above and below the plane of the galaxy?
A) a few million years B) a few tens of millions of years C) a few thousand years D) a few hundred years