Questions from Modern Physics

Q: Example 16.1 (Section 16.1) showed that

Example 16.1 (Section 16.1) showed that for sound waves in air with frequency 1000 Hz, a displacement amplitude of 1.2 × 10-8 m produces a pressure amplitude of 3.0 × 10-2 Pa. (a). What is the wavele...

Q: (a). Show that the fractional change in the speed of

(a). Show that the fractional change in the speed of sound (dv/v) due to a very small temperature change dT is given by dv/v = 1 2 dT/T. (Hint: Start with Eq. 16.10.) Eq. 16.10: U =

Q: Three moles of an ideal gas are in a rigid cubical box

Three moles of an ideal gas are in a rigid cubical box with sides of length 0.300 m. (a). What is the force that the gas exerts on each of the six sides of the box when the gas temperature is 20.0°C...

Q: With the assumptions of Example 18.4 (Section 18.

With the assumptions of Example 18.4 (Section 18.1), at what elevation above sea level is air pressure 90% of the pressure at sea level?

Q: (a).Calculate the mass of nitrogen present in a volume

(a).Calculate the mass of nitrogen present in a volume of 3000 cm3 if the gas is at 22.0°C and the absolute pressure of 2.00 × 10-13 atm is a partial vacuum easily obtained in laboratories. (b).What i...

Q: Modern vacuum pumps make it easy to attain pressures of the order

Modern vacuum pumps make it easy to attain pressures of the order of 10-13 atm in the laboratory. Consider a volume of air and treat the air as an ideal gas. (a). At a pressure of 9.00 × 10-14 atm an...

Q: The Lagoon Nebula (Fig. E18.24) is a

The Lagoon Nebula (Fig. E18.24) is a cloud of hydrogen gas located 3900 light-years from the earth. The cloud is about 45 light-years in diameter and glows because of its high temperature of 7500 K. (...

Q: Consider an ideal gas at 270C and 1.00 atm.

Consider an ideal gas at 270C and 1.00 atm. To get some idea how close these molecules are to each other, on the average, imagine them to be uniformly spaced, with each molecule at the center of a sm...

Q: (a) What is the total translational kinetic energy of the

(a) What is the total translational kinetic energy of the air in an empty room that has dimensions 8.00 m × 12.00 m × 4.00 m if the air is treated as an ideal gas at 1.00 atm? (b). What is the speed...

Q: A flask contains a mixture of neon (Ne), krypton (

A flask contains a mixture of neon (Ne), krypton (Kr), and radon (Rn) gases. Compare (a) the average kinetic energies of the three types of atoms and (b) the root-mean-square speeds. (Hint: Appendix D...