CUET · PHYSICS · PYQ PAPER 2023
If \( n_h \) is the number of holes per unit volume and \( n_e \) is the number of conduction electrons per unit volume in an extrinsic semiconductor. The relation between \( n_h, n_e \) and \( n_i \) is (\( n_i \) is intrinsic carrier concentration):
- A \( n_i^2 = n_e n_h \)
- B \( n_i = n_e n_h \)
- C \( n_e = n_h \)
- D \( n_i^2 > n_e n_h \)
Answer & Solution
Correct Answer
(A) \( n_i^2 = n_e n_h \)
Step-by-step Solution
Detailed explanation
According to the Law of Mass Action, the product of the free electron concentration and the hole concentration in a semiconductor at thermal equilibrium is constant. This product always equals the square of the intrinsic carrier concentration, regardless of whether the…
See the Complete Solution
Get step-by-step explanations for this and 2.5 Lakh+ more JEE, NEET & CET questions.
- Unlock all solutions
- Practice the full chapter
- Track accuracy across PYQs
4.8 rated on Google Play · 14,000+ reviews
More questions from PHYSICS
- Two wires of equal lengths carrying equal currents bent in the form of two loops, one in square shape and the other in circular shape having one turn only are suspended in same, uniform magnetic field perpendicular to the plane of loops. Choose the correct optionCUET 2025 Medium
- What is the relative permittivity of a medium of relative permeability \( \mu_r = 1.0 \) in which an electromagnetic wave travels at a speed of \( v = 2 \times 10^8 \, \text{m s}^{-1} \)?CUET 2023 Hard
- The resistivity of an iron wire is \( 10 \times 10^{-8} \, \Omega \text{ m} \). The resistance of an iron wire is \( 5 \, \Omega \). If its length as well as thickness is doubled then its resistivity will be :CUET 2023 Easy
- The electric field in a region is \( \vec{E} = (6\hat{i} + 3\hat{j} + 5\hat{k}) \text{ N/C} \).
The electric flux due to this electric field through an area of \( 100 \text{ cm}^2 \) lying in the X-Y plane is :CUET 2025 Medium - A plane electromagnetic wave of frequency 25 GHz is propagating in vacuum along the z-direction. At a particular point in space and time, the magnetic field is given by a value \(5 \times 10^{-8} \text{ T}\) along Y-direction. The corresponding electric field is (speed of light \(c = 3 \times 10^8 \text{ m/s}\))CUET 2025 Medium
- The coil of a moving coil galvanometer is wound over a metallic frameCUET 2025 Easy
More PYQs from CUET
- Sickle cell anaemia is :CUET 2023 Medium
- The correct statements for the activation energy of a reaction are:
(A) Activation energy is the energy difference between the activated complex and the total energy of the reactants.
(B) Higher is the activation energy, the faster is the rate of reaction.
(C) Catalyst increases the rate of the reaction by following the path of lower activation energy.
(D) In the Arrhenius equation, \(E_a\) corresponds to the activation energy
Choose the correct answer from the options given below :CUET 2025 Hard - If \(x \sqrt{1+y}+y \sqrt{1+x}=0\), where \(|x|<1,|y|<1\) and \(x \neq y\), thenCUET 2025 Easy
- Choose the phenomenon from the following, which shows that light is a transverse wave.CUET 2025 Medium
- Area of a rectangle having vertices \(P, Q, R\) and \(S\) with position vectors \(-\hat{i}+\frac{1}{2} \hat{j}+4 \hat{k}, \hat{i}+\frac{1}{2} \hat{j}+4 \hat{k}, \hat{i}-\frac{1}{2} \hat{j}+4 \hat{k}\) and \(-\hat{i}-\frac{1}{2} \hat{j}+4 \hat{k}\) respectively is :CUET 2023 Medium
- Mameesh took a loan of Rs 9,00,800 from bank at an interest rate of \(6 \%\) per annum for 10 years. If she has to pay the loan back with the help of equal monthly installments (EMI). Then, the EMI using reduced balance method is (approx) :
(Given: \((1.005)^{-120}=0.5496\))CUET 2025 Easy