"Perfect mirrors" are made by
a. coating a glass surface with an extremely pure layer of silver or aluminum.
b. coating a glass surface with an extremely pure layer of silver or aluminum and then coating the metal surface with a quarter-wavelength thickness of the dielectric magnesium fluoride.
c. stacking thin layers of different dielectric materials on a glass surface.
d. heating an ordinary mirror almost to its melting point.
c
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The percentage of 235U--as opposed to 238U--present in light-water uranium power reactors is closest to
A) 90 percent. B) 50 percent. C) 5 percent. D) 75 percent. E) 25 percent.
What are the most likely sources of the methane gas detected in the Martian atmosphere by the Mars Express orbiter and the Curiosity rover?
A) biological activity only B) biological or geological activity C) comet impacts only D) geological activity only
Compared to a 1-kg block of solid iron, a 2-kg block of solid iron has twice as much
A) inertia. B) mass. C) volume. D) all of the above E) none of the above
Like the Sun and the Moon, the planets appear to move from west to east from one day to the next
Indicate whether the statement is true or false