Why is nuclear reactor waste radioactive?
a. Radiation from the reactor makes everything in or near it radioactive.
b. Used fuel rods contain fission fragments which are radioactive.
c. Spent fuel rods pick up contamination from the reactor.
d. all of the above
B
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The simple Big Bang theory does not solve all of the problems that we observe (or hope to observe) in our universe. These problems include all of the following EXCEPT:
How fast does a pulsar initially spin?
a. 10 times per second b. 1 time per second c. 100 times per second d. 1000 times per second
Which of the following best describes why the Sun emits most of its energy in the form of visible light?
A) Like all objects, the Sun emits thermal radiation with a spectrum that depends on its temperature, and the Sun's surface temperature is just right for emitting mostly visible light. B) Nuclear fusion in the Sun's core produces visible light photons. C) The visible light comes from energy level transitions as electrons in the Sun's hydrogen atoms jump between level 1 and level 2. D) The Sun's gas is on fire like flames from wood or coal, and these flames emit visible light.
What percentage of the solar nebula's mass consisted of rocky material?
A) 0 percent B) 0.4 percent C) 2 percent D) 20 percent E) 80 percent