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Question

The amount of heat radiated per second by a body of surface area 20 cm2 kept at temperature 27oC is H and wavelength having maximum share of emission is λ, find H and λ  approximately
(e = emissivity = 0.6,         σ=6×106wattm2K4
Wein's constant =0.288 cmK)


Your Answer
A
H=58 watt, λ=0.44×103 cm
Your Answer
B
H=68 watt, λ=0.96×103 cm
Correct Answer
C
H=58 watt, λ=0.96×103 cm
Your Answer
D
H=68 watt, λ=0.44×103 cm

Solution

The correct option is B H=58 watt, λ=0.96×103 cm
H=σeAT4
    =6×106×0.6×20×104×(300)4
    =6×106×12×104×81×108
    =81×6×12×10258 watt
Also,
λm.T=0.288 cmK
λm=.288300cm=0.96×103cm

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