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Question

A beam of the plane polarized light having flux 103 watt falls normally on a polarizer of a cross sectional area 3×104m2. The polarizer rotates with an angular frequency of 31.4rad/s. The energy of the light passes through the polarizer per resolution will be_____

A
104 Joule
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B
103 Joule
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C
102 Joule
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D
101 Joule
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Solution

The correct option is A 104 Joule
The time period of revolution is given by, T = 2πω
where ω is the angular frequency.
Now, the power of the source is given by, P=103 Watt
Now, T = 2×3.1431.4 = 0.2 sec
Hence, Energy = 0.5 × power × time
=103×0.2×0.5=104 J

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