A heat engine operating between a pair of hot and cold reservoirs with respective temperatures of 400 K and 200 K will have what maximum efficiency?
a. 50%
b. 50%
c. 40%
d. 45%
e. 25%
a
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An excited atom can lose energy by
a. emitting a photon b. absorbing a photon c. undergoing the photoelectric effect d. increasing its de Broglie wavelength e. the uncertainty principle
Conduction: In an experiment to measure the thermal conductivity of a certain material, a slab of material 10.0 mm thick separates a steam chamber from a block of ice with a square cross-section with dimensions 8.00 cm × 8.00 cm. After 5.00 min of running the experiment, 64.0 g of ice have melted. What is the thermal conductivity of this material? The latent heat of fusion of water is 33.5 × 104 J/kg, the latent heat of vaporization of water is 2.256 × 106 J/kg, and both the ice and water are under 1.00 atm of pressure.
A. 0.130 W/m ? K B. 0.250 W/m ? K C. 0.440 W/m ? K D. 0.620 W/m ? K E. 1.12 W/m ? K
If we increased the pressure in a gas, how will its spectral lines be affected?
What will be an ideal response?
When a mirror with a fixed beam on it is rotated through a certain angle, the reflected beam is rotated through an angle
A) equal to the angle of rotation. B) twice as much. C) four times as much. D) none of the above