### Physics 1B Thermal Physics & Electromagnetism

`H. E. Smith                                                                                                       Fall 2002`
 Physics 1B - Reading Quiz #1
1. In a mixture of oxygen and hydrogen gas in thermal equilibrium we would expect that
• A. the hydrogen molecules will be moving faster than the oxygen molecules.
• B. the kinetic energy of the hydrogen molecules will be greater than the KE of the oxygen molecules.
• C. the oxygen molecules will be moving faster than the hydrogen molecules.
• D. the kinetic energy of the oxygen molecules will be greater than the KE of the hydrogen molecules.
• E. the speeds of the oxygen and hydrogen molecules will be the same.

2. A flat metal disk has a hole in the center. As the disk is heated
• A. the diameter of the disk will increase and the diameter of the hole will decrease.
• B. the diameter of the disk will increase and the diameter of the hole will increase.
• C. the diameter of the disk will decrease and the diameter of the hole will decrease.
• D. the diameter of the disk will decrease and the diameter of the hole will increase.
• E. nothing.