Wien's Law: Two identical metal bars are heated up until they are both glowing. One of them is "red hot" and the other is "blue hot." Which one is hotter, the one that glows red or the one that glows blue?
A. the red one
B. the blue one
C. We cannot tell without knowing more about the two bars.
Answer: B
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The temperature of a gas is most closely related to:
A. the kinetic energy of translation of its molecules B. its total molecular kinetic energy C. the sizes of its molecules D. the potential energy of its molecules E. the total energy of its molecules
Thin film interference is responsible for the colors of
a. bird feathers. b. gasoline spills. c. soap bubbles. d. all of the above.
Diffraction grating ?1 has half the lines/cm that diffraction grating ?2 does. When used with a certain wavelength of light, both gratings give first-order maxima. Which of the following statements is true for the same wavelength of light
a. Both gratings must also give second-order maxima. b. Grating ?1 must give a second-order maximum. c. Grating ?2 must give a second-order maximum. d. It is possible that neither grating gives a second-order maximum.
When there is a 5.00 A current through an 10.0-? device, how much power is being dissipated in the device?
A) 50.0 W B) 250 W C) 500 W D) 2.50 kW