When light passing through a prism undergoes dispersion, the effect is a result of:
a. different wavelengths traveling at different speeds.
b. different wavelengths having different indices of refraction.
c. different wavelengths refracting differently.
d. All of the above.
d
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A filament of tungsten wire is 0.001 m in diameter, and the filament is heated to 2500 K. The work function of tungsten is 4.5 eV.
(a) Calculate the probability of electrons having sufficient energy to be emitted from the filament. (b) Calculate the emission current density from the tungsten wire. (c) What length of wire can produce a thermionic electron current of 1 A?
A sample of helium gas with an initial temperature of Ti in an insulated cylinder with initial volume Vi is suddenly and violently compressed to one-half its volume. The absolute temperature of the gas after the compression is observed to have doubled. (Note: In a quasistatic adiabatic compression of a monatomic gas, TV2/3= constant.) A suitable replacement process for this process would be
A. a slow isothermal compression from Vi to 
Vi.
B. a slow adiabatic compression from Vi to Vi.
C. Heating the gas to double its temperature followed by a slow adiabatic compression from Vi to Vi.
D. a slow adiabatic compression from Vi to Vi followed by heating to bring the temperature to 2Ti.
E. a slow adiabatic compression from Vi to Vi followed by cooling to bring the temperature to 2Ti.
F. None of the above.
Changes that do not alter the chemical composition of a substance are called ______________ changes
Fill in the blank(s) with correct word
Calculate the force on a string tied to a ceiling with a 9.0-kg mass attached