In terms of energy levels of electrons, a potential well has
a. a negative value.
b. a positive or a negative value.
c. a positive value.
d. none of these.
a
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What must occur for an object to be considered a main sequence star?
a. Hydrostatic equilibrium b. Nuclear fusion reaction in the core c. Protostar life begins d. Both a and b
One end of resistor A is connected to the positive terminal of a battery and the other end is connected to resistor B. The opposite end of resistor B is connected to the negative terminal of the battery. If resistor A has resistance R and B has a resistance 2R, what is the equivalent resistance of this circuit?
a) R b) 3R/2 c) 2R d) 2R/3 e) 3R
Bottles of perfume sometimes have thick glass (n = 1.5) walls which give the impression the volume is larger than it really is. Assume a cylindrical bottle with an inner radius of 1.0 cm and an outer radius of 2.0 cm. What percentage of the apparent volume is the real volume?
a. 95% b. 60% c. 80% d. 64% e. 75%
A beam of X-rays of different frequencies is reflected at 10 degrees off a crystal of interatomic spacing 0.2 nm. Which X-ray wavelength is preferentially reflected?
a. 0.0943 nm b. 0.139 nm c. 0.069 5 nm d. 1.02 × 10^-10 m e. 3.47 × 10^-11 m