hgbn asked in 科學其他:科學 · 6 years ago

求解這題英文物理問題!!超急!!超急!!

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題目:

As shown in the figure, the orientation of the transmission axis for each of three ideal polarizing sheets is labeled relative to the vertical direction. A beam of light, polarized in the vertical direction, is incident on the first polarizer

with an intensity of 1.00 kW/m2. What is the intensity of the beam after it has passed through the three polarizing sheets when θ1 = 30°, θ2 = 30°, and θ3= 60°?

A) 563 W/m2

B) 141 W/m2

C) 316 W/m2

D) 188 W/m2

E) 433 W/m2

感激不盡

1 Answer

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  • LI
    Lv 7
    6 years ago
    Best Answer

    公式:I = I0 * cosθ^2所以I = I0* (cos30°)^2 * (cos30°)^2 * (cos60°)^2=1000 * 3/4 * 3/4 * 1/4= 141 (W/m^2) → B

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