Assuming that xenon (atomic number 54) and krypton (atomic number 36) have the same temperature and pressure, in which gaseous medium does sound travel faster?
A) Xenon
B) Krypton
C) a mixture of both
D) the same in both
Answer: B
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Which is the shorter time unit - a light-second, a light-minute, or a light-year?
a. light-second b. light-minute c. light-year d. None of the other choices are correct.
If a 1 kg mass is completely converted into energy, the amount of energy released would be __________
Fill in the blank(s) with correct word
Greenhouse gases in the atmosphere, such as carbon dioxide and water vapor, make Earth warmer than it would be otherwise because these gases __________.
a. form clouds that emit thermal radiation b. absorb infrared light emitted by the surface c. reflect visible light coming from the Sun d. absorb visible light coming from the Sun
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.