The most common isotope of uranium is U-238, but the form used in nuclear bombs and nuclear power plants is U-235. Given that uranium has atomic number 92, how many neutrons are in each of these two isotopes?
What will be an ideal response?
U-238 has 146 neutrons, and U-235 has 3 fewer, or 143 neutrons.
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Sustained energy output by fusion is a daily occurrence in
A) military installations. B) breeder reactors. C) the Sun. D) Earth's interior.
Radiative energy is
A) heat energy. B) energy from nuclear power plants. C) energy carried by light. D) energy of motion.
What can you conclude about a Type I supernova?
A) It was originally a high-mass star. B) Its spectrum will show large amounts of hydrogen. C) It was originally a low-mass star. D) Its core was mostly iron. E) The star never reached the Chandrasekhar limit.
Applying the Newton's version of Kepler's third law (or the orbital velocity law) to a star orbiting 40,000 light-years from the center of the Milky Way Galaxy allows us to determine
A) the total mass of the entire Milky Way Galaxy. B) the mass of the black hole thought to reside in the center of the galaxy. C) the percentage of the galaxy's mass that is made of dark matter. D) the mass of the Milky Way Galaxy that lies within 40,000 light-years of the galactic center.