MCQOPTIONS
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| 1. |
A metal ball of surface area \[200\ c{{m}^{2}}\] and temperature \[{{527}^{o}}C\] is surrounded by a vessel at \[{{27}^{o}}C\]. If the emissivity of the metal is 0.4, then the rate of loss of heat from the ball is \[(\sigma =5.67\times {{10}^{-8}}J/{{m}^{2}}\ -s-{{k}^{4}})\] |
| A. | 108 joules approx. |
| B. | 168 joules approx. |
| C. | 182 joules approx. |
| D. | 192 joules approx. |
| Answer» D. 192 joules approx. | |