In a metal that is not a superconductor, as the temperature increases which of the following is true?
(a) Free electrons are scattered more frequently by structural defects.
(b) Free electrons are scattered more frequently thermal vibrations.
(c) Free-electron drift velocity is increased because of scattering by vibrating atoms.
(d) Free-electron drift velocity is a constant.
(b) Free electrons are scattered more frequently thermal vibrations.
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Standing Sound Waves: Consider two pipes of the same length: one pipe is open at both ends and the other pipe is closed on one end but open at the other end. If the fundamental frequency of the totally open pipe is 300 Hz, what is the fundamental frequency of the other pipe?
A. 150 Hz B. 300 Hz C. 450 Hz D. 600 Hz
Based on the frequency with which we see comets from Earth, astronomers estimate the total number of comets in the solar system to be
A) 100 million. B) 1 billion. C) 10 billion. D) 100 billion. E) 1 trillion.
Prior to decoupling, all matter was ________, with free electrons and nuclei
Fill in the blank(s) with correct word
What happens when the air is saturated?
A) The condensation rate equals the evaporation rate. B) The air is at its water vapor capacity. C) Relative humidity is 100%. D) The air temperature equals the dew point temperature. E) all of the above