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MHT CET202313 May 2023Morning ShiftPhysicsThermal Properties of MatterActual

A black body at temperature 127^ C radiates heat at the rate of 5 cal / cm ^2 ~s . At a temperature 927^ C , its rate of emission in units of cal / cm ^2 ~s will be

Options

  1. A405
  2. B35
  3. C45
  4. D350

Correct answer

A. 405

Step-by-step solution

From Stefan - Boltzmann's Law aligned & E = T ^4 & E T ^4 aligned aligned E ₁ E ₂ & = ( T ₁ ~T ₂ )^4= ( 400 1200 )^4 E ₁ E ₂ & = 1 81 E ₂ & =81 E ₁ & =81 5 & =405 cal / cm ^2 ~s aligned

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