If we could see our own galaxy from 2 million light-years away, it would appear
A) as a flattened disk with a central bulge and barred-spiral arms.
B) as a faintly glowing band of light stretching all the way around the sky.
C) to fill the sky with widely spaced stars.
D) like a single, dim star.
A
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X-rays are scattered by _________on the atoms in the sample.
Fill in the blank(s) with the appropriate word(s).
Power: A series circuit contains a 20-? resistor, a 200-mH inductor, a 10-?F capacitor, and an ac power source. At what frequency should the power source drive the circuit in order to have maximum power transferred from the driving source?
A. 0.45 kHz B. 0.17 kHz C. 0.28 kHz D. 0.96 kHz E. 0.11 kHz
Enzymes are catalysts which means that they
A) speed up biochemical reactions which would normally occur too slowly B) slow down biochemical reactions which would normally occur too quickly C) prevent unwanted biochemical reaction occurring D) destroy harmful chemical species
A sound source (normal frequency of 1000 Hz) approaches a stationary observer at one-half the speed of sound. The observer hears a frequency of
A) 2000 Hz. B) 500 Hz. C) 250 Hz. D) 1500 Hz. E) 1414 Hz.