When white light passes through a cool cloud of gas, we see
A) visible light.
B) infrared light.
C) thermal radiation.
D) an absorption line spectrum.
E) an emission line spectrum.
D
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Gluons can emit
A. electrons. B. protons. C. gravitons. D. baryons. E. gluons.
When the temperature of the Sun's core goes up, what happens next?
A) Fusion reactions slow down, core shrinks and heats. B) Fusion reactions speed up, core expands and cools. C) Fusion reactions speed up, the core shrinks and cools. D) Fusion reactions slow down, the core expands and heats.
If a wave has a period of 0.077 sec, it has a frequency of
a. 1/13 Hz. b. 3.6 Hz. c. 169 Hz. d. 13 Hz.
Radioactive Decay: Today, uranium contains 0.72% 235U (half-life = 0.70 billion years) and 99.28% 238U (half-life = 4.5 billion years). At a time 1.9 billion years ago, what was the fraction of 235U in uranium?
A. 3.53% B. 4.72% C. 4.90% D. 6.75%