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18. The temperature of a perfect black body is727^° C and its area is 0.1 m2. If stefan's constantis 5.67 x 10-8 watt/m2-k4, then heat radiated by it in 1 minute is a)8100 cal b)81000 cal c)810 cal d) 81 ca |
| Answer» 18. The temperature of a perfect black body is727^° C and its area is 0.1 m2. If stefan's constantis 5.67 x 10-8 watt/m2-k4, then heat radiated by it in 1 minute is a)8100 cal b)81000 cal c)810 cal d) 81 ca | |