Unpolarized light of intensity S_0 passes through two sheets of polarizing mater

Question

Unpolarized light of intensity S_0 passes through two sheets of polarizing material whose transmission axes make an angle of 60 degree with each other as shown in the figure. What is the intensity of the transmitted beam, S_T? A) zero B) S_0/16 C) 3S_0/4 D)S_0/8 E) S_0/4 An astronomer observes electromagnetic waves emitted by oxygen atoms in a distant galaxy that have a frequency of 5.710 times 10^14 ?. In the laboratory on earth, oxygen atoms emit waves that have a frequency of 5.841 times 10^14 Hz. Determine the relative velocity of the galaxy with respect to the astronomer on the earth. A) 6724 times 10^6 m/s, toward Earth B) 6.724 times 10^6 m/s, away from Earth C) 2.931 times 10^8 m/s, away from Earth D) 4.369 times 10^4 m/s, away from Earth E) 4.369 times 10 m/s, toward Earth

Explanation / Answer

solving first question of the page

intensity after first polarisor=So/2

afer second one

intensity=So/2*cos^(60)=So/8

option (D) is correct

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