1. | \(414\) nm | 2. | \(300\) nm |
3. | \(830\) nm | 4. | \(207\) nm |
1. | decreases |
2. | increases |
3. | remains the same |
4. | may increase or decrease depending on the semiconductor |
1. | conductor |
2. | insulator |
3. | semiconductor |
4. | none of the above |
In a good conductor, the energy gap between the conduction band and the valence band is:
1. Infinite
2. Wide
3. Narrow
4. Zero
1. | The resistivity of a semiconductor increases with an increase in temperature. |
2. | Substances with an energy gap of the order of \(10\) eV are insulators. |
3. | In conductors, the valence and conduction bands may overlap. |
4. | The conductivity of a semiconductor increases with an increase in temperature. |
In the energy band diagram of a material shown below, the open circles and filled circles denote holes and electrons respectively. The material is a/an:
1. | \(\mathrm{p}\text-\)type semiconductor |
2. | insulator |
3. | metal |
4. | \(\mathrm{n}\text-\)type semiconductor |
1. | resistance |
2. | conductance |
3. | both resistance and conductance |
4. | neither resistance nor conductance |
Carbon, Silicon, and Germanium atoms have four valence electrons each. Their valence and conduction bands are separated by energy gaps represented by \(\left(E_g\right)_C,(E_g)_{Si}~\text{and}~(E_g)_{Ge}\) respectively. Which one of the following relationships is true in their case?
1. | \(\left(E_g\right)_C<\left(E_g\right)_{G e} \) | 2. | \(\left(E_g\right)_C>\left(E_g\right)_{S i} \) |
3. | \(\left(E_g\right)_C=\left(E_g\right)_{S i} \) | 4. | \(\left(E_g\right)_C<\left(E_g\right)_{S i}\) |
1. | decreases for conductors but increases for semiconductors. |
2. | increases for both conductors and semiconductors. |
3. | decreases for both conductors and semiconductors. |
4. | increases for conductors but decreases for semiconductors. |