A one-way mirror works because of
a. interference.
b. diffraction.
c. its surfaces being half-silvered.
d. dispersion.
e. polarization.
c
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The presence of breccias among the lunar rock samples shows that
a. volcanism did not occur on the Moon. b. molten lava once flowed over the lunar surface. c. the crust must have been made of anorthosite. d. water once existed on the Moon in the form of small lakes and streams. e. the lunar surface was fragmented by meteorite impacts.
What was the approximate temperature of the universe at an age of 1015 s?
A) about 1 K B) about 100 K C) about 105 K D) about 1015 K
The most effective wavelengths to see through the clouds of Venus to the surface are ________
Fill in the blank(s) with correct word
Alicia intends to swim to a point straight across a 100 m wide river with a current that flows at 1.2 m/s. She can swim 2.5 m/s in still water. At what angle, measured from the upstream direction, must she swim upstream to achieve her goal?
What will be an ideal response?