The most important highlight of Precambrian Time was the
A) explosion of life.
B) asteroid impact that resulted in the formation of our Moon.
C) accumulation of free oxygen in the atmosphere.
D) emergence of reptiles.
Answer: C
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Compared to our Sun, a typical white dwarf has:
A) about the same mass and density. B) about the same mass and a million times higher density. C) a larger mass and a 100 times lower density. D) a smaller mass and half the density. E) a smaller mass and twice the density.
Two charged particles are placed a short distance apart, in vacuum. The electric force by one on the other
A) is transmitted instantaneously. B) is due to gravity. C) is due to friction. D) cannot be felt due to the vacuum. E) is transmitted at the speed of light.
A ray of white light, incident upon a glass prism, is dispersed into its various color components. Which one of the following colors experiences the greatest angle of deviation?
a. orange b. violet c. red d. green
What is the maximum radiation pressure exerted by sunlight in space (S = 1350 W/m2) on a flat black surface?
a. 2.25 × 10^?5 Pa b. 0.06 Pa c. 7 × 10^?4 Pa d. 4.5 × 10^?6 Pa e. 9.0 × 10^?6 Pa