How can an electron be ejected from a nucleus in beta decay if it wasn't in the nucleus to begin with?
a. The electron doesn't come from the nucleus—it comes from an orbit circling the nucleus.
b. A neutron in the nucleus turns into a proton, electron, and a neutrino.
c. A proton in the nucleus turns into a neutron, electron, and a neutrino.
d. none of the above
b
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As a liquid changes into a vapor ________
a. heat energy is absorbed b. heat energy is given off c. the temperature of the liquid rises substantially d. the specific heat maintains the temperature
Might reverse osmosis be used to obtain fresh water from a sugar-water solution?
A) No, osmosis and reverse osmosis only apply to aqueous solutions containing ions. B) Yes, reverse osmosis can be applied to any aqueous solution for the generation of fresh water. C) No, the molecular attractions between sugar and water are too strong. D) Yes, because sugar molecules are smaller than sodium or chloride ions.
The mer of polyethylene is made from two atoms of ______________and two atoms of hydrogen.
Fill in the blank(s) with the appropriate word(s).
A real image of a candle formed with a converging lens can be viewed on a screen placed
A. at either focal point of the lens. B. at a single position determined by the distance of the object and the construction of the lens. C. anywhere on the side of the lens from which the light emerges. D. nowhere; that is, it can't be viewed on a screen at all.