The relation between the number of free electrons in semiconductors $(n)$ and its temperature $(T)$ is
A$n \propto T^2$
B$n \propto T$
C$n \propto \sqrt{T}$
D$n \propto T^{3 / 2}$
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D$n \propto T^{3 / 2}$
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A diode having potential difference $0.5 V$ across its junction which does not depend on current, is connected in series with resistance of $20 \Omega$ across source. If $0.1 A$ passes through resistance then what is the voltage of the source
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