The energy of a photon that ionizes a hydrogen atom from the ground state will be _________ the energy of a photon that ionizes a different hydrogen atom from the first excited state (n – 2)
a. larger than b. smaller than
c. equal to d. twice
a
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On an H-R diagram, stellar masses
A) can be determined for main-sequence stars but not for other types of stars. B) are greatest in the lower left and least in the upper right. C) decrease from upper left to lower right. D) are impossible to determine.
The thermal conductivity of aluminum is twice that of brass. Two rods (one aluminum and the other brass) of the same length and cross-sectional area are joined together end to end
The free end of the brass rod is maintained at 0°C and the free end of the aluminum rod is maintained at 200°C. If no heat escapes from the sides of the rods, what is the temperature at the place where the two rods are joined together? A) 76°C B) 133°C C) 148°C D) 155°C
A sonic boom cannot be produced by
A) an aircraft flying slower than the speed of sound. B) a whip. C) a speeding bullet. D) all of the above
During each cycle, a refrigerator removes 20.0 kJ of heat from the freezing compartment and ejects 24.0 kJ into a room
(a) How much work per cycle is required each cycle to run this refrigerator? (b) What is the coefficient of performance of this refrigerator?