The emissive power of a sphere of area `0.07m^(2)` is 0.5 k cal/`m^(2)s`. The amount of heat radiated by the spherial surface in 20 second isA. 7 kcalB. 0.7 kcalC. 0.07 kcalD. 20 kcal

The emissive power of a sphere of area `0.07m^(2)` is 0.5 k cal/`m^(2)

1.	The emissive power of a sphere of area `0.07m^(2)` is 0.5 k cal/`m^(2)s`. The amount of heat radiated by the spherial surface in 20 second isA. 7 kcalB. 0.7 kcalC. 0.07 kcalD. 20 kcal
Answer» Correct Answer - B `E=(Q)/(At)` `therefore Q=EA t=0.5xx0.07xx20=0.7` kcal

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The emissive power of a sphere of area `0.07m^(2)` is 0.5 k cal/`m^(2)s`. The amount of heat radiated by the spherial surface in 20 second isA. 7 kcalB. 0.7 kcalC. 0.07 kcalD. 20 kcal

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