Why do we use fuses?
a. to eliminate shock hazards
b. to prevent fires
c. to save on the cost of electricity
d. to store charge
B
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We can model a general cyanine-type dye molecule as if it contained N electrons trapped in a “box”-like potential energy function, where N is some even integer. The energy of a single quanton in a box is given by En = E1n2, where n is an integer and E1 is the energy of the ground (n = 1) energy level. If for a given molecule there are four electrons trapped in the molecule’s “box,” what is the lowest possible total energy of those electrons?
A. Etot = E1 B. Etot = 4E1 C. Etot = 8E1 D. Etot = 10E1 E. Etot = 30E1
A slit of width 2.0 ?m is used in a single slit experiment with light of wavelength 650 nm. If the intensity at the central maximum is I0, what is the intensity 10° from the center?
A) 0.50I0 B) 0.35I0 C) 0.030I0 D) 0.53I0 E) 0.43I0
The volume holding 0.63 mole of an ideal gas is compressed to 1/4 of its original volume by a piston. At the same time the pressure of the gas triples. If the original absolute temperature of the gas was T, that is the new temperature after compression?
a. 4/3T c. 0.63(3/4T) b. 3/4T d. 0.63(4/3T)
How does the mass of a giant star compare with the mass of the black hole it may become? How do the densities compare?
What will be an ideal response?