The mass of 238U is not quite an integer multiple of 1H mass. This is primarily because
a. the proton and neutron have different masses.
b. there are several isotopes of uranium.
c. of the binding energy of uranium.
d. uranium is radioactive.
c
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Which of the following is the best description of how a fluorescent bulb works?
A) Electrons flowing through the bulb get heated up within the bulb, and these electrons emit light. B) A gas flows from one end of the bulb to the other, and the gas atoms are energized by the electric field which causes the atoms to emit light. C) Electrons flow through the bulb, causing a chemical reaction in the gas atoms inside the bulb, which causes these atoms to emit light. D) A gas fills the bulb and when the gas atoms strike the walls of the bulb the material in the wall emits light. E) Electrons flow from one end of the bulb to the other, hitting gas atoms and causing them to emit light.
Earth is the terrestrial planet with the largest moon
Indicate whether the statement is true or false
Consider a situation where you exert a force F on a crate of mass m, moving it at a speed v a distance d across a floor in a time interval t.The quantity Fd/t is
a. the kinetic energy of the crate. b. the potential energy of the crate. c. the linear momentum of the crate. d. the work you do on the crate. e. the power you supply to the crate.
Why does the very thin region at the top of a soap bubble sometimes appear black?
a. Because no light passes through it. b. Because inverted light waves and non-inverted light waves reflecting from the two surfaces cancel each other. c. Because it is too thin to reflect light. d. Because both reflected waves are inverted or else neither is inverted. e. Because the rest of the film creates a shadow that obscures the colors we would otherwise see.