Two stars, A and B, have the same emissivity, but the radii and surface temperatures are different with RA = 0.5RB, and TA = 2TB. Assuming the temperature of space to be negligible, which star radiates the most energy per unit time?
a. Star A
b. Star B
c. Both radiate the same amount of energy per unit time.
d. More information is needed in order to make a determination.
a
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The compound Ni3Al is used to strengthen nickel based alloys used in high temperature gas turbine materials. The crystal structure of Ni3Al is a cube with Al atoms at the eight cube corners and Ni at all of the cube face centers.
(a) What is the Bravais lattice type for Ni3Al and (b) What are the atom positions?
A refrigerator condenser is a heat exchanger that converts a refrigerant from a vapor to a liquid at constant pressure and approximately constant temperature. If ammonia is used as a refrigerant and 10 kg/s is condensed at 25ºC when the surrounding temperature is 20ºC, determine the heat transfer from the refrigerant using data from the Appendix Chart C-7.
What will be an ideal response?
Light is reflecting off a wedge-shaped thin piece of glass producing bright and dark interference fringes. If a certain location has a bright fringe, a nearby point will have a bright fringe if the thickness of the glass increases by:
a. one wavelength of the light. c. 1/8 of a wavelength of the light. b. 1/4 of a wavelength of the light. d. 1/2 of a wavelength of the light.
The ratio of the circumference of any circle to its diameter is ?. Similarly, the ratio of the energy of any photon to its frequency is
1) h, Planck's constant, 2) uncertain, unlike ?, 3) the wavelength of the photon, 4) c, the photon's speed, which is 5) a basic constant of nature setting a lower limit on the smallness of things. 6) a basic constant of nature setting an upper limit on the speed of things.