What is supercritical reaction?
a. A reaction in a nuclear reactor that is about to fail because of fuel depletion.
b. A chain reaction that would simply die out because not enough neutrons are being absorbed by uranium-235.
c. A chain reaction that grows rapidly because an average of more than one neutron from each fission reaction causes another fission reaction.
d. A chain reaction based on plutonium.
e. One that can continue indefinitely.
c
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The intrinsic brightness of a star is referred to as its
A) radiance B) luminosity C) surface temperature D) apparent brightness
A long wire 0.7 mm in diameter with an emissivity of 0.9 is placed in a large quiescent air space at 270 K. If the wire is at 800 K, calculate the net rate of heat loss. Discuss your assumptions.
GIVEN
• Long wire in still air
• Wire diameter (D) = 0.7 mm= 7*10-4 m
• Wire temperature (Ts) = 800 K
• Emissivity (?) = 0.9
• Air temperature (T?) = 270 K FIND
• The net rate of heat loss
ASSUMPTIONS
• The enclosure around the wire behaves as a blackbody enclosure at the temperature of the air
• The natural convection heat transfer coefficient is 18 W/(m2 K)
• Steady state conditions prevail
SKETCH
_______________ produces the majority of the geological activity on Earth
Fill in the blank(s) with correct word
In modern astronomy, an interferometer
a. is the highest resolution optical telescope ever built. b. is located in Arecibo, Puerto Rico. c. is a set of optical telescopes linked together to provide very high resolution. d. is a set of radio telescopes linked together to provide very high resolution. e. is either a set of optical telescopes linked together to provide very high resolution or is a set of radio telescopes linked together to provide very high resolution.