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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

#### 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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