Verified Solution • 2025–26 Session moderate

QAIPMT-2007-Ph-2354: NEET 2007 Physics - Class 11 AIPMT-2007-Ph-2354 Solution: A particle starting from the origin (0 0) moves in a straight…

A particle starting from the origin (0 0) moves in a straight line in the (x y) plane. Its coordinates at a later time are (33)(\sqrt{3} 3). The path of the particle makes with the x-axes an angle of 45∘45^\circ 60∘60^\circ 0∘0^\circ 30∘30^\circ.

Multiple Choice Options

  • A r2σ(t+273)44πR2{{{r^2}\sigma {{\left( {t + 273} \right)}^4}} \over {4\pi {R^2}}} 4 � R 2 r 2 _ ( t + 273 ) 4 _
  • B 16π2r2σt4R2{{16{\pi ^2}{r^2}\sigma {t^4}} \over {{R^2}}} R 2 16 � 2 r 2 _ t 4 _
  • C r2σ(t+273)4R2{{{r^2}\sigma {{\left( {t + 273} \right)}^4}} \over {{R^2}}} R 2 r 2 _ ( t + 273 ) 4 _
  • D 4πr2σt4R2{{4\pi {r^2}\sigma {t^4}} \over {{R^2}}} R 2 4 � r 2 _ t 4 _

Step-by-Step Verified Solution

Power radiated by the sun at t�C = _ ( t + 273 ) 4 4 � r 2 Power received by a unit surface = _ ( t + 273 ) 4 4 � r 2 4 � R 2 = r 2 _ ( t + 273 ) 4 R 2

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