What is the smallest thickness of a soap film n 1.33 that, Ask an Expert

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Q. What is the smallest thickness of a soap film (n = 1.33) that would appear black if illuminated with 450 -nm light? Assume there is air on both sides of the soap film.

Q. An initially stationary block of mass m is on the floor. A force of magnitude 0.500mg is then applied at upward angle θ = 20°. What is the magnitude of the acceleration of the block across the floor if (a)μs = 0.600 and μk = 0.510 and (b)μs = 0.400 and μk = 0.340?

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