The majority of the radiation emitted to the general public in the normal operation of a nuclear plant comes from the ________
a. cooling water discharged to a lake or a river.
b. reactor core directly.
c. spent fuel rods stored on site.
d. fission fragment gases vented to the atmosphere.
e. low level wastes shipped from the plant
d
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Suppose you live at latitude 40°N. Based on the given right ascensions and declinations, which of the following stars is never visible in your sky?
A) Spica: RA = 13hr 25m, dec = -11°09' B) Deneb: RA = 20hr 41m, dec = +45°16' C) Sirius: RA = 6hr 45m, dec = -16°42' D) Alpha Centauri: RA = 14hr 40m, dec = -60°50' E) Vega: RA = 18hr 37m, dec = +38°47'
How old was the universe when light from the most distant galaxies in the Hubble Ultra Deep Field was emitted?
A: 100,000 years. B: 5 million years. C: 10 billion years. D: 400 million years. E: 800 million years.
If ? = 4, which one of the following is a possible quantum number for n?
A) 0 B) 2 C) 3 D) 4 E) 8
If an electron vibrates up and down 1000 times each second, it generates an electromagnetic wave having a
A) period of 1000 s. B) speed of 1000 m/s. C) wavelength of 1000 m. D) frequency of 1000 Hz. E) wavelength of 1000 km.