Two solid sphere of copper have radii 10 cm and 8 cm respectively. Their temperature are `227^(@)C and 127^(@)C` respectively they are allowed to cool
Two solid sphere of copper have radii 10 cm and 8 cm respectively. Their temperature are `227^(@)C and 127^(@)C` respectively they are allowed to cool by radiation in a room of temperature `27^(@)C` then the initial rates of heat los are in the ratio
A. `(85)/(14)`
B. `(34)/(7)`
C. `(7)/(34)`
D. `(14)/(85)`
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Correct Answer - B
`(((dQ)/(dt))_(1))/(((dQ)/(dt))_(2))=(T_(1)^(4))/(T_(2)^(4))=(625)/(256)=2.44`.
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