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Two Bodies a and B Having Equal Surface Areas Are Maintained at Temperature 10°C and 20°C. the Thermal Radiation Emitted in a Given Time by a and B Are in the Ratio - Physics

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Question

Two bodies A and B having equal surface areas are maintained at temperature 10°C and 20°C. The thermal radiation emitted in a given time by A and B are in the ratio

  • 1 : 1.15

  • 1 : 2

  • 1 : 4 

  • 1 : 16

Solution

1 : 1.15

From Stefan-Boltzmann law, energy of the thermal radiation emitted per unit time by a blackbody of surface area A is given by `u = σAT^4 `
Here, `σ`  is Stefan-Boltzmann constant.
`(uA)/(uB)` = `"T"_"A"^4/(T_B^4)`
`(u_A)/ (u_B) = ( 273 +10 )^4/ (273 + 20  )^4`
`uA/uB = 1/1.15`

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APPEARS IN

 HC Verma Solution for Concepts of Physics - Vol. 2 (2018 to Current)
Chapter 6: Heat Transfer
MCQ | Q: 5 | Page no. 97
Solution Two Bodies a and B Having Equal Surface Areas Are Maintained at Temperature 10°C and 20°C. the Thermal Radiation Emitted in a Given Time by a and B Are in the Ratio Concept: Heat Transfer - Radiation.
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