Qualification > Sciences
Physics Help HERE ONLY !!
Ghost Of Highbury:
the constant is different for different materials
it is called the resistivity for the material
R = k*l / a
the resistivities of metals increase at high. temperatures, for most other materials
it decreases
:)
don't worry u don't need to know the value
AS girl:
--- Quote from: Eamyzz on June 03, 2009, 07:25:14 pm ---manah and Ig grl i love ur pictures...they r so WOOOOOW :o ;)
--- End quote ---
Thanks..i like ur pic 2-it's from legally blonde 1 right? I watched this movie like 5 times and never got bored from it!
MaNa:
--- Quote from: care on June 03, 2009, 07:26:02 pm ---can someone explain me the difference between virtual and real image?
--- End quote ---
real image is foremed when all the ray frm a pont on an object are brought togeth again to another point
the real image can be seen in the screen
virtual image is formed where the virtual rays appear to come from when a screen is placed no image are formed
care:
http://en.wikipedia.org/wiki/Electrical_resistance#Resistance_of_a_conductor
and it's not the density of the material!
Ghost Of Highbury:
--- Quote from: care on June 03, 2009, 07:26:02 pm ---can someone explain me the difference between virtual and real image?
--- End quote ---
a real image is one which can be produced on a screen and is formed by rays that actually pass through it
a virtual image cannot be formed on a screen, rays appear to come from the ray but actually don't.
:)
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