A sodium light, having wavelength 589.3 nm, is used to view a soap film to make it look black when directed perpendicular to the film. What is the minimum thickness of the soap film if the index of refraction of soap solution is 1.38?
A) 294 nm B) 194 nm C) 314 nm D) 114 nm E) 214 nm
Question 2
A metal bar is 20 cm long and has a rectangular cross-section measuring 1.0 cm 2.0 cm. What is the voltage drop along its length when it carries a 4000-A current? The resistivity of the metal is 1.68 10-8 m.
A) 0.067 V B) 0.67 V C) 0.034 V D) 0.34 V
black swallower
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