InterviewSolution
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InterviewSolution
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The coefficient of thermal conductivity of copper, mercury and glass are respectively `K_(c), K_(m)` and `K_(g)` that `K_(c) gt K_(m) gt K_(g)`. If the same quantity of heat is to flow per second per unit of each and corresponding temperature gradients are `X_(c), X_(m)` and `X_(g)`, thenA. `X_(c) = X_(m) = X_(g)`B. `X_(c) lt X_(m) gt X_(g)`C. `X_(c) lt X_(m) lt X_(g)`D. `X_(m) lt X_(c) lt X_(g)` |
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Answer» Correct Answer - C `(Q)/(At) = K (Delta theta)/(l) rArr K(Delta theta)/(l) =` consta nt `rArr (Delta theta)/(l) prop (l)/(K)` Hence, if `K_(c) gt K_(m) gt K_(g)`, then `((Delta theta)/(l))_(c) lt ((Delta theta)/(l))_(m) lt ((Delta theta)/(l))_(g) rArr X_(c) lt X_(m) lt X_(g)` Because higher `K` implies lower value of the temerature gradient. |
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