Question 2 (10 pts): A black, completely absorbing object with area 2.0 cm2 is p

Question

Question 2 (10 pts): A black, completely absorbing object with area 2.0 cm2 is placed 2 m from a 100 W lamp. The emitted light is unpolarized and isotropic. (a) What is the intensity of the light at the object? (b) How much radiation pressure does the object feel from the lamp? (c) How much radiation force does the object feel from the lamp? (d) If a vertical polarizer is placed in the path of the light, what is the new radiation pressure? (e) After the vertical polarizer, another polarizer oriented 60 degrees from vertical, is placed in the path of the light. What is the new radiation pressure? (f) The order of the polarizers is swapped what is the new radiation pressure?

Explanation / Answer

(a) Intensity is the power of light in per unit area

Formula

Intensity = Power / Area

I = (100) / (2 x 10^-4)

I = 5 x 10^5 W/m^2

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