Questions from Modern Physics

Q: The size of an oxygen molecule is about 2.0 ×

The size of an oxygen molecule is about 2.0 × 10-10 m. Make a rough estimate of the pressure at which the finite volume of the molecules should cause noticeable deviations from ideal gas behavior at o...

Q: Calculate the integral in Eq. (18.31),

Calculate the integral in Eq. (18.31), 0 ∞ v2 f (v2) dv, and compare this result to 1v22av as given by Eq. (18.16). (Hint: You may use the tabulated integral where n is a positiv...

Q: A metal wire, with density r and Young’s modulus Y,

A metal wire, with density r and Young’s modulus Y, is stretched between rigid supports. At temperature T, the speed of a transverse wave is found to be v1. When the temperature is increased to T +

Q: In the troposphere, the part of the atmosphere that extends from

In the troposphere, the part of the atmosphere that extends from earth’s surface to an altitude of about 11 km, the temperature is not uniform but decreases with increasing elevation...

Q: At very low temperatures the molar heat capacity of rock salt varies

At very low temperatures the molar heat capacity of rock salt varies with temperature according to Debye’s T3 law: where k = 1940 J/mol ∙ K and u = 281 K. (a). H...

Q: Estimate the ratio of the thermal conductivity of Xe to that of

Estimate the ratio of the thermal conductivity of Xe to that of He. (a) 0.015; (b) 0.061; (c) 0.10; (d) 0.17.

Q: The rate of effusion—that is, leakage of a gas

The rate of effusion—that is, leakage of a gas through tiny cracks—is proportional to vrms. If tiny cracks exist in the material that’s used to seal the space between two glass panes, how many times g...

Q: A carpenter builds a solid wood door with dimensions 2.00

A carpenter builds a solid wood door with dimensions 2.00 m × 0.95 m × 5.0 cm. Its thermal conductivity is k = 0.120 W/m ∙ K. The air films on the inner and outer surfaces of the door have the same co...

Q: One experimental method of measuring an insulating material’s thermal conductivity is to

One experimental method of measuring an insulating material’s thermal conductivity is to construct a box of the material and measure the power input to an electric heater inside the box that maintains...

Q: Rods of copper, brass, and steel—each with crosssectional

Rods of copper, brass, and steel—each with crosssectional area of 2.00 cm2—are welded together to form a Y-shaped figure. The free end of the copper rod is maintained at 100.0°C, and the free ends of...