NCERT Solutions For Chapter 14: Semiconductor Electronics

Jasmine Grover logo

Jasmine Grover Content Strategy Manager

Content Strategy Manager

NCERT Solutions for Class 12 Physics Chapter 14 Semiconductor Electronics: Materials, Devices and Simple Circuits are provided in the article below. A semiconductor is a material whose resistivity is between a conductor such as metallic copper and an insulator such as glass. Its resistivity falls as the temperature rises which is completely opposite to any metal. 

Class 12 Physics Chapter 14 Semiconductor Electronics belong to Unit 9 - Electronic Devices which has a weightage of 7 marks in the CBSE Board examinations. Class 12 Physics Semiconductor Electronics NCERT Solutions covers the concepts of intrinsic and extrinsic semiconductors, P-n Junction, and Rectifiers

Download PDF: NCERT Solutions for Class 12 Physics Chapter 14

NCERT Solutions for Class 12 Physics Chapter 14

NCERT Solutions For Class 12 Physics: Chapter 14 Semiconductor Electronics: Materials, Devices and Simple CircuitsNCERT Solutions For Class 12 Physics Chapter 14 Semiconductor Electronics: Materials, Devices and Simple CircuitsNCERT Solutions For Class 12 Physics Chapter 14 Semiconductor Electronics: Materials, Devices and Simple CircuitsNCERT Solutions For Class 12 Physics Chapter 14 Semiconductor Electronics: Materials, Devices and Simple CircuitsNCERT Solutions For Class 12 Physics Chapter 14 Semiconductor Electronics: Materials, Devices and Simple CircuitsNCERT Solutions For Class 12 Physics Chapter 14 Semiconductor Electronics: Materials, Devices and Simple Circuits

Class 12 Physics Chapter 14 – Topics Covered

  • Semiconductors have resistivity or conductivity in between that of metals and insulators.
ρ ~ 10-5. 106 Ωm, σ ~ 10+5 .10-6 Sm-1
  • Types of Semiconductors: There are two types of semiconductors – Elements Semiconductors and Compound Semiconductors.
(i) Elements Semiconductors are available in natural form, e.g. germanium and silicon.
(ii) Compound Semiconductors are made by compounding the metals, e.g. InP, CdS, polyaniline, GaAs, CdSe, anthracene, etc.
  • On the basis of purity, semiconductors are classified as intrinsic semiconductors and extrinsic semiconductors.
    Intrinsic Semiconductors are pure semiconductor that does not have any significant dopant species present

ne  = nh = ni 

where, ne and nh are the number densities of electrons and holes respectively and ni is the intrinsic carrier concentration.

  • Extrinsic Semiconductors are pure semiconductors that are doped with an impurity.
Extrinsic semiconductors are classified into two types: p-type semiconductors and n-type semiconductors.
  • Formation of Depletion Region in p-n junction: During the formation of a p-n junction, due to the concentration gradient across the p and n sides, the holes diffuse from the p-side to the n-side and electrons diffuse from the n-side to the p-side.

Formation of Depletion Region in p-n junction

Formation of Depletion Region in p-n junction


Also Read:

Check-Out: 

CBSE CLASS XII Related Questions

  • 1.

    Assertion : In an ideal step-down transformer, the electrical energy is not lost.

    Reason (R): In a step-down transformer, voltage decreases but the current increases.

      • If both Assertion and Reason (R) are true and Reason (R) is the correct explanation of Assertion .
      • If both Assertion and Reason (R) are true but Reason (R) is not the correct explanation of Assertion .
      • If Assertion is true but Reason (R) is false.
      • If both Assertion and Reason (R) are false.

    • 2.
      Consider the arrangement shown in the figure. A black vertical arrow and a horizontal thick line with a ball are painted on a glass plate. It serves as the object. When the plate is illuminated, its real image is formed on the screen.
      Which of the following correctly represents the image formed on the screen?
       black vertical arrow and a  horizontal thick


        • 3.
          In Bohr’s model of hydrogen atom, find the percentage change in the radius of its orbit when an electron makes a transition from \( n = 3 \) state to \( n = 2 \) state.


            • 4.
              An electric dipole consists of charges \(\pm 4 \mu C\) separated by a distance of \(6\,cm\). Calculate the electric field at a point on the axial line at a distance \(20\,cm\) from its center.


                • 5.
                  Two infinitely long conductors kept along XX' and YY' axes are carrying current \( I_1 \) and \( I_2 \) along -X axis and -Y axis respectively. Find the magnitude and direction of the net magnetic field produced at point P(X, Y).


                    • 6.
                      A beam of light coming from a distant source is refracted by a spherical glass ball (refractive index 1.5) of radius 15 cm. Draw the ray diagram and obtain the position of the final image formed.

                        CBSE CLASS XII Previous Year Papers

                        Comments


                        No Comments To Show