Discussion
Which constant appears in the shot noise expression?
Answer: D
The electronic charge appears, since shot noise arises from the granularity of charge itself and its density is \( 2qI \) per hertz. Boltzmann's constant belongs to thermal noise. Permeability and the gas constant have no part in either. The presence of \( q \) rather than \( k \) is the immediate signature of a current-dependent mechanism rather than a temperature-dependent one.
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