An iron rod becomes magnetic when
A) opposite ions accumulate at each end.
B) its atoms are aligned.
C) the net spins of many internal electrons are aligned.
D) its electrons stop moving and point in the same direction.
Answer: C
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If you think of a battery as an electric charge "pump," the battery voltage is analogous to __________
Fill in the blank(s) with correct word
For luminosity classification, fat stars have skinny spectral lines
Indicate whether the statement is true or false
Which ray diagrams are correct? The three rays in each diagram are distinguished by different types of lines. Hint: Check the behavior of each ray as it interacts with the lens
a.
B and C
b.
C and D
c.
D and E
d.
C and E
e.
C, D and E
Thin Films: The colors on an oil slick are caused by reflection and
A. diffraction. B. interference. C. refraction. D. polarization. E. ionization.