MCQ
The width of forbidden energy gap in the semiconductor is approximately :
  • 1 eV
  • B
    10 eV
  • C
    100 eV
  • D
    0.01 eV

Answer

Correct option: A.
1 eV
A

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

 ————— gives the information on field strength, direction, and nature of the charge.
An electron is moving with a speed of $10^8 \mathrm{~m} / \mathrm{sec}$ perpendicular to a uniform magnetic field of intensity $B .$ Suddenly intensity of the magnetic field is reduced to $\mathrm{B} / 2$. The radius of the path becomes from the original value of $r$
$\mathrm{H}^{+}, \mathrm{He}^{+}$and $\mathrm{O}^{++}$  ions having same kinetic energy pass through a region of space filled with uniform magnetic field $B$ directed perpendicular to the velocity of ions. The masses of the ions $\mathrm{H}^{+}, \mathrm{He}^{+}$and $\mathrm{O}^{++}$ are respectively in the ratio $1 : 4 : 16.$ As a result
A photon of energy hv is absorbed by o free electron of a metal having work function $\varphi<\text{hv}.$
An electric field can deflect:
A convex lens is made of a material having refractive index $1.2.$ Both the surfaces of the lens are convex. If it is dipped into water $(\mu=1.33),$ it will behave like:
An electromagnetic wave can be produced when the charge is
The temperature of the cold junction of thermo$-$couple is $0^{\circ} \mathrm{C}$ and the temperature of hot junction is $\mathrm{T}^{\circ} \mathrm{C}$. The $e.m.f.$ is $\mathrm{E}=16 \mathrm{~T}-0.04$ $\mathrm{T}^2 \mu$ volts. The temperature of inversion is
Consider the following two statements:
  1. Linear momentum of the system remains constant.
  2. Centre of mass of the system remains at rest.
  1. ​​​​​​A implies B and B implies A.
  2. A does not imply B and B does not imply A.
  3. A implies B but B does not imply A.
  4. B implies A but A does not imply B.
Colour code of carbon resitance for blue colour is: