Q.
Air (sp. Heat at room temperature and 1 atm=0.71 J/g K ; density) present in a room (dimensions ) got heated up when a bulb of 500 watt was switched on for 10 minutes, the increase in room temperature if heat capacity of four walls and roof is is:
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a
183 K
b
1.83 K
c
213 K
d
715 K
answer is B.
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Detailed Solution
1 Watt=1 J/s ; volume of room ;
Wt. of air in room= volume x density
Heat given out by bulb=500 watt x (10 x 60) s
=500 J/s x 600s
But heat given out by bulb= Heat gained by (walls+roof)+Heat gained by air
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