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MHT CET2010PhysicsThermal Properties of Matter

The sphere of radii 8 ~cm and 2 ~cm are cooling. Their temperatures are 127^ C and 527^ C respectively. Find the ratio of energy radiated by them in the same time

Options

  1. A0.06
  2. B0.5
  3. C1
  4. D2

Correct answer

C. 1

Step-by-step solution

Total energy radiated from a body Or array l Q=A T⁴ t Q t A T⁴ array Q t r² T⁴ ( A=4 r² ) aligned Q₁ Q₂ &= ( r₁ r₂ )² ( T₁ T₂ )⁴ &= ( 8 2 )² [ 273+127 273+527 ]⁴=1 aligned

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