# OSU Ph 212 2nd midterm

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1. The index of refraction
n = c/v

• n = optical density (n=>1)
• c = speed of light == 3.00 *108
• v = the apparent spped of light in a material (v<=c)
2. Intensity

Intensity is the power contained within the wave divided by the surface over the wave moves

power tells you the most information
I = P / A

• I = intensity
• P = power
• A = area
3. intensity

expands in all directions Area is
Area = 4πr2

Area of a sphere
4. Intensity

Expands in one direction Area is
Area = 2πr^2

Area of a hemisphere
5. Intensity

Doesn't expandes Area is
Area = πr2
6. Inverse Square Law
is any physical law stating that some physical quantity or strength is inversely proportional to the square of the distance from the source of that physical quantity.
7. Logx (A*B) =
= (logxA) + (logxB)

= 10A*10B == 10A+B
8. Logx(A/B) =
= Logx(A) - Logx(B)

= (10A)/(10B) == 10A-B
9. Logx(An) =
= n(logx(A))

10An == 10A*n
10. Change in base log
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 Author: Rayen ID: 46566 Card Set: OSU Ph 212 2nd midterm Updated: 2010-11-01 21:54:08 Tags: OSU Ph Folders: Description: 2nd midterm information Show Answers: