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Standard VII

Physics

Black-Body Radiation

a Two identic...

Question

(a) Two identical vessels A and B containing equal volume of water are placed in sun. The outer surface of one vessel A is blackened, while of other vessel B is polished. Thermometer $T_{1}$ and $T_{2}$ are used to measure the temperature of vessel A and B respectively. Which thermometer will record a higher temperature? Give a reason for your answer.
(b) If the two vessels A and B as described in part (a) are filled with boiling water and placed inside the room, which thermometer will show a higher temperature after 15 minutes? Give a reason for your answer.

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Solution

a) $T_{1}$ Because black body is a good absorber of heat than a polished one. So, vessel $A$ will have higher temperature.

b) $T_{2}$ Because black body is a good emitter of heat energy than a polished one. So, vessel $B$ will have higher temperature after 15min.

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a) T1 Because black body is a good absorber of heat than a polished one. So, vessel A will have higher temperature.b) T2 Because black body is a good emitter of heat energy than a polished one. So, vessel B will have higher temperature after 15min.

a) $T_{1}$ Because black body is a good absorber of heat than a polished one. So, vessel $A$ will have higher temperature.

b) $T_{2}$ Because black body is a good emitter of heat energy than a polished one. So, vessel $B$ will have higher temperature after 15min.