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Thermionic emission from a heated filament varies with its temperature `T` as

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Thermionic emission from a heated filament varies with its temperature `T` as
A. `T^(-1)`
B. `T`
C. `T^(2)`
D. `T^(3//2)`
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Correct Answer - C
According to Richardson-Dushman equation, number of thermions emitted per sec unit area `J=AT^(2) e^(-W0//kT) implies J propT^(2)`
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