Questions
A sphere, a cube and a thin circular plate are heated to the same temperature. If they are made of same material and have equal masses then which one of the three objects cools faster
detailed solution
Correct option is C
According to Stefan's law, the rate of cooling is given by−dTdt=eσAmcT4−T04or −dTdt∝ASince the surface area of the plate is maximum for the given mass and hence, the circular plate cools the fastest.Talk to our academic expert!
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For a black body at temperature 727°C, its radiating power is 60W and temperature of surrounding is 227° C. If temperature of black body is changed to 1227°C, then its
radiating power will be :
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