This question has Statement $1$ and Statement $2$. Of the four choices given after the Statements,choose the one that best describes the two Statements.
Statement $1$ : $A$ pure semiconductor has a negative temperature coefficient of resistance.
Statement $2$ : On raising the temperature,more charge carriers are released into the conduction band.
Statement $1$ : $A$ pure semiconductor has a negative temperature coefficient of resistance.
Statement $2$ : On raising the temperature,more charge carriers are released into the conduction band.
- AStatement $1$ is false,Statement $2$ is true.
- BStatement $1$ is true,Statement $2$ is false.
- CStatement $1$ is true,Statement $2$ is true,Statement $2$ is not a correct explanation of Statement $1$.
- DStatement $1$ is true,Statement $2$ is true,Statement $2$ is the correct explanation of Statement $1$.
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In a semiconductor,which of the following statements are correct?
$(i)$ There are no free electrons at $0\, K$.
$(ii)$ There are no free electrons at any temperature.
$(iii)$ The number of free electrons increases with temperature.
$(iv)$ The number of free electrons is less than that in a conductor.
$(i)$ There are no free electrons at $0\, K$.
$(ii)$ There are no free electrons at any temperature.
$(iii)$ The number of free electrons increases with temperature.
$(iv)$ The number of free electrons is less than that in a conductor.
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The energy gap of silicon is $1.14 \ eV$. The maximum wavelength at which silicon will begin absorbing energy is
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View SolutionAssertion $(A)$: When a wire of aluminium and another wire of silicon are heated from room temperature to $80^{\circ} C$,the conductivity of aluminium decreases and that of silicon increases.
Reason $(R)$: Aluminium has a positive temperature coefficient of resistivity and silicon has a negative temperature coefficient of resistivity.
Reason $(R)$: Aluminium has a positive temperature coefficient of resistivity and silicon has a negative temperature coefficient of resistivity.
When a semiconductor is heated,its resistance
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