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Properties of Matter question

2010 · Q178
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Properties of Matter question

2010 · Q178

NEETPhysicsProperties of MatterMCQ+4 / −1
The total radiant energy per unit area, normal to the direction of incidence, received at a distance R from the centre of a star of radius r, whose outer surface radiates as a black body at a temperature TK is given by
  1. A
    σr2T4R2{{\sigma {r^2}{T^4}} \over {{R^2}}}R2σr2T4​
  2. B
    σr2T44πR2{{\sigma {r^2}{T^4}} \over {4\pi {R^2}}}4πR2σr2T4​
  3. C
    σr2T4R4{{\sigma {r^2}{T^4}} \over {{R^4}}}R4σr2T4​
  4. D
    4πσr2T4R2{{4\pi \sigma {r^2}{T^4}} \over {{R^2}}}R24πσr2T4​
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