Neutral Density Glass
Posted on Monday, November 22, 2010 in Photography
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VERY TOUGH COLLEGE PHYSICS 2 QUESTION (S)?
You place a neutral block of silver near a small glass sphere which has a charge of 2x10^-08 coulombs uniformly distributed over its surface.
A) How long do you have to wait to make sure that the mobile electron sea inside the silver block has reached equilibrium?
1) Less than a nanosecond (1x10^-9 s)
2) About 1 second
3) Several hours
4) About 10 minutes
B) In equilibrium, what is the drift speed of the mobile electrons inside the silver?
1) 0 m/s
2) About 1x10^-5 m/s
3) About 1x10^5 m/s
C) In the equation v = uE , what is the meaning of the symbol u?
1) The density of mobile electrons inside the metal, in (electrons/m3)
2) The mobility of an electron inside the metal, in (m/s)/(N/C)
3) The time it takes a block of metal to reach equilibrium in seconds.
A 1
B 1
C 2
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huecycle.com - Welding glass neutral density filter tutorial
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