_________is the degradation of a material because of electrochemical reactions with its environment.
Fill in the blank(s) with the appropriate word(s).
Corrosion
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Electromagnetic radiation, or light, travels at speed ___________ m/s
Fill in the blank(s) with correct word
Why does light follow the Inverse Square Law?
A: Every object that emits light has some intrinsic brightness (luminosity) but its apparent brightness changes with distance B: An object emits light in all directions around it and the light is diluted through spheres around the light source C: The intensity of the light drops off with the square of the distance D: The inverse square comes from the 3D nature of space around a light source E: All of the above
The point P lies along the perpendicular bisector of the line connecting two long straight wires S and T that are perpendicular to the page. A set of directions A through H is shown next to the diagram. When the two equal currents in the wires are directed up out of the page, the direction of the magnetic field at P is closest to the direction of
a.
E.
b.
F.
c.
G.
d.
H.
e.
A
A 500 nm wavelength light illuminates a soap film with an index of refraction 1.33 to make it look bright. If the beam of light is incident normal on the film, what is the minimum thickness of the film?
A) 47.0 nm B) 74.0 nm C) 94.0 nm D) 152 nm E) 268 nm