If a person in Alaska were locked out of his house on a day when the temperature outside was -40°C, his thick clothing would mostly reduce the loss of thermal energy by
a. conduction.
b. convection.
c. radiation.
d. all of the above. e. convection and radiation.
A
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What is synchronous rotation?
A. a body's rotation rate that is equal to its parent planet's rotation rate B. a body's rotation rate that is equal to its orbital period C. a body's rotation rate that does not change with time D. a body's rotation rate that changes with orbital distance
Why are main-sequence lifetimes shorter for more massive stars?
A) They aren't; higher mass stars have longer lifetimes. B) Strong stellar winds cause higher mass stars to lose mass quickly. C) Higher core temperatures allow fusion to proceed much more rapidly. D) More massive stars are made of heavier elements that don't fuse as easily.
The recombination era of the big bang was very important in several ways. Explain what happened during this time and what observable effects of the era existed
What will be an ideal response?
An n-type semiconductor is produced by doping Group IV silicon with 1×1022 atoms/m3 of Group V antimony. Assume that the semiconductor is at room temperature, and that this semiconductor is in the extrinsic range of operation.
(a) What is the density of electrons in the conduction band? (b) Calculate the room-temperature electrical conductivity for this semiconductor.