Questions
A spherical black body with a radius of 12cm radiates 450 watt power at 500 K. If the radius were halved and the temperature doubled, the power radiated in watt would be
detailed solution
Correct option is C
According to Stefan-Boltzman law, rate of energy radiated by a black body is given asE=σAT4=σ4πR2T4 Given E1=450 W,T1=500 K,R1=12 cmR2=R12, T2=2T1,E2=?E2E1=σ4πR22T24σ4πR12T14=R2R12T2T14E2E1=14×16=4E2=E1×4=450×4=1800 WTalk to our academic expert!
Similar Questions
For a black body at temperature 727°C, its radiating power is 60W and temperature of surrounding is 227° C. If temperature of black body is changed to 1227°C, then its
radiating power will be :
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