Types of Semi Conductors
PHXII14:SEMICONDUCTOR ELECTRONICS- MATERIALS- DEVICES AND SIMPLE CIRCUITS

365567 The density of an electron - hole pair in a pure germanium is \(3 \times {10^{16}}{m^{ - 3}}\) at room temperature. On doping with aluminium the hole density increases to \(4.5 \times {10^{22}}{m^{ - 3}}\). Now the electron density (in \({m^{ - 3}}\)) in doped germanium will be

1 \(1 \times {10^{10}}\)
2 \(2 \times {10^{10}}\)
3 \(0.5 \times {10^{10}}\)
4 \(4 \times {10^{10}}\)
PHXII14:SEMICONDUCTOR ELECTRONICS- MATERIALS- DEVICES AND SIMPLE CIRCUITS

365568 Suitable impurities are added to a semiconductor depending on its use. This is done to

1 increase its life
2 enable it to withstand high voltage
3 increase its electrical conductivity
4 increase its electrical resistivity
PHXII14:SEMICONDUCTOR ELECTRONICS- MATERIALS- DEVICES AND SIMPLE CIRCUITS

365569 A pure \(S i\) crystal has \(5 \times 10^{22}\) atoms \({m^{ - 3}}\). It is doped by 1 ppm concentration of pentavalent atoms. The number of holes is: \(\left( {{n_i} = 1.5 \times {{10}^{16}}\;{m^{ - 3}}} \right)\)

1 \(2.5 \times {10^6}\;{m^{ - 3}}\)
2 \(4.5 \times {10^9}\;{m^{ - 3}}\)
3 \(6 \times {10^9}\;{m^{ - 3}}\)
4 \(4 \times {10^6}\;{m^{ - 3}}\)
PHXII14:SEMICONDUCTOR ELECTRONICS- MATERIALS- DEVICES AND SIMPLE CIRCUITS

365570 The objective of adding impurities to a semiconductor is

1 To increase the conductivity of the semiconductor
2 To increase the density of total current carries
3 To increase the density of either holes or electrons but not both
4 To eliminate the electron-hole pairs produced in intrinsic semiconductor
PHXII14:SEMICONDUCTOR ELECTRONICS- MATERIALS- DEVICES AND SIMPLE CIRCUITS

365567 The density of an electron - hole pair in a pure germanium is \(3 \times {10^{16}}{m^{ - 3}}\) at room temperature. On doping with aluminium the hole density increases to \(4.5 \times {10^{22}}{m^{ - 3}}\). Now the electron density (in \({m^{ - 3}}\)) in doped germanium will be

1 \(1 \times {10^{10}}\)
2 \(2 \times {10^{10}}\)
3 \(0.5 \times {10^{10}}\)
4 \(4 \times {10^{10}}\)
PHXII14:SEMICONDUCTOR ELECTRONICS- MATERIALS- DEVICES AND SIMPLE CIRCUITS

365568 Suitable impurities are added to a semiconductor depending on its use. This is done to

1 increase its life
2 enable it to withstand high voltage
3 increase its electrical conductivity
4 increase its electrical resistivity
PHXII14:SEMICONDUCTOR ELECTRONICS- MATERIALS- DEVICES AND SIMPLE CIRCUITS

365569 A pure \(S i\) crystal has \(5 \times 10^{22}\) atoms \({m^{ - 3}}\). It is doped by 1 ppm concentration of pentavalent atoms. The number of holes is: \(\left( {{n_i} = 1.5 \times {{10}^{16}}\;{m^{ - 3}}} \right)\)

1 \(2.5 \times {10^6}\;{m^{ - 3}}\)
2 \(4.5 \times {10^9}\;{m^{ - 3}}\)
3 \(6 \times {10^9}\;{m^{ - 3}}\)
4 \(4 \times {10^6}\;{m^{ - 3}}\)
PHXII14:SEMICONDUCTOR ELECTRONICS- MATERIALS- DEVICES AND SIMPLE CIRCUITS

365570 The objective of adding impurities to a semiconductor is

1 To increase the conductivity of the semiconductor
2 To increase the density of total current carries
3 To increase the density of either holes or electrons but not both
4 To eliminate the electron-hole pairs produced in intrinsic semiconductor
PHXII14:SEMICONDUCTOR ELECTRONICS- MATERIALS- DEVICES AND SIMPLE CIRCUITS

365567 The density of an electron - hole pair in a pure germanium is \(3 \times {10^{16}}{m^{ - 3}}\) at room temperature. On doping with aluminium the hole density increases to \(4.5 \times {10^{22}}{m^{ - 3}}\). Now the electron density (in \({m^{ - 3}}\)) in doped germanium will be

1 \(1 \times {10^{10}}\)
2 \(2 \times {10^{10}}\)
3 \(0.5 \times {10^{10}}\)
4 \(4 \times {10^{10}}\)
PHXII14:SEMICONDUCTOR ELECTRONICS- MATERIALS- DEVICES AND SIMPLE CIRCUITS

365568 Suitable impurities are added to a semiconductor depending on its use. This is done to

1 increase its life
2 enable it to withstand high voltage
3 increase its electrical conductivity
4 increase its electrical resistivity
PHXII14:SEMICONDUCTOR ELECTRONICS- MATERIALS- DEVICES AND SIMPLE CIRCUITS

365569 A pure \(S i\) crystal has \(5 \times 10^{22}\) atoms \({m^{ - 3}}\). It is doped by 1 ppm concentration of pentavalent atoms. The number of holes is: \(\left( {{n_i} = 1.5 \times {{10}^{16}}\;{m^{ - 3}}} \right)\)

1 \(2.5 \times {10^6}\;{m^{ - 3}}\)
2 \(4.5 \times {10^9}\;{m^{ - 3}}\)
3 \(6 \times {10^9}\;{m^{ - 3}}\)
4 \(4 \times {10^6}\;{m^{ - 3}}\)
PHXII14:SEMICONDUCTOR ELECTRONICS- MATERIALS- DEVICES AND SIMPLE CIRCUITS

365570 The objective of adding impurities to a semiconductor is

1 To increase the conductivity of the semiconductor
2 To increase the density of total current carries
3 To increase the density of either holes or electrons but not both
4 To eliminate the electron-hole pairs produced in intrinsic semiconductor
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PHXII14:SEMICONDUCTOR ELECTRONICS- MATERIALS- DEVICES AND SIMPLE CIRCUITS

365567 The density of an electron - hole pair in a pure germanium is \(3 \times {10^{16}}{m^{ - 3}}\) at room temperature. On doping with aluminium the hole density increases to \(4.5 \times {10^{22}}{m^{ - 3}}\). Now the electron density (in \({m^{ - 3}}\)) in doped germanium will be

1 \(1 \times {10^{10}}\)
2 \(2 \times {10^{10}}\)
3 \(0.5 \times {10^{10}}\)
4 \(4 \times {10^{10}}\)
PHXII14:SEMICONDUCTOR ELECTRONICS- MATERIALS- DEVICES AND SIMPLE CIRCUITS

365568 Suitable impurities are added to a semiconductor depending on its use. This is done to

1 increase its life
2 enable it to withstand high voltage
3 increase its electrical conductivity
4 increase its electrical resistivity
PHXII14:SEMICONDUCTOR ELECTRONICS- MATERIALS- DEVICES AND SIMPLE CIRCUITS

365569 A pure \(S i\) crystal has \(5 \times 10^{22}\) atoms \({m^{ - 3}}\). It is doped by 1 ppm concentration of pentavalent atoms. The number of holes is: \(\left( {{n_i} = 1.5 \times {{10}^{16}}\;{m^{ - 3}}} \right)\)

1 \(2.5 \times {10^6}\;{m^{ - 3}}\)
2 \(4.5 \times {10^9}\;{m^{ - 3}}\)
3 \(6 \times {10^9}\;{m^{ - 3}}\)
4 \(4 \times {10^6}\;{m^{ - 3}}\)
PHXII14:SEMICONDUCTOR ELECTRONICS- MATERIALS- DEVICES AND SIMPLE CIRCUITS

365570 The objective of adding impurities to a semiconductor is

1 To increase the conductivity of the semiconductor
2 To increase the density of total current carries
3 To increase the density of either holes or electrons but not both
4 To eliminate the electron-hole pairs produced in intrinsic semiconductor