A 0.75-?F capacitor is connected to a 400-V battery. Find the charge on the capacitor
a. 4.0E–2 C
b. 3.0E–4 C
c. 1.9E–3 C
d. 5.3E–8 C
e. 5.3E+4 C
b
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A pair of hydrogen nuclei fused together produces
A) helium. B) lithium. C) beryllium. D) carbon. E) iron.
Gravitational lensing is the process by which
A) a massive object magnifies and distorts the light from an object behind it B) the wavelengths of light from a star are shifted as it moves about its center of mass C) a planet passes in front of its parent star and blocks part of its light D) a massive object accelerates another object that passes close to it
A magnesium alloy that begins with the letters “AK” has major alloy elements of aluminum and _________.
Fill in the blank(s) with the appropriate word(s).
Why don't we see hydrogen Balmer lines in the spectra of stars with temperatures of 3,200 K?
a. There is no hydrogen in stars this cool. b. The stars are hot enough that most of the hydrogen is ionized and the atoms cannot absorb energy. c. These stars are so cool that nearly all of the hydrogen atoms are in the ground state. d. Stars of this temperature are too cool to produce an absorption spectrum. e. Stars of this temperature are too hot to produce an absorption spectrum.