Question
Explain the difference between conductor, insulator and semiconductor on the basis of energy band in solids.
✓
Answer
On the basis of energy band, the difference between conductor, insulator and semi-conductor is divided as follows :
(i) Conductors: Those substances for which the forbidden energy gap $\Delta E$ is almost zero, are called conductors. In these the valence band and conduction band overlap each other.
(ii) Insulators: Those substances for which the value of forbidden energy gap $\Delta E g$ situated between the valence band and conduction band is 6 eV or more, are called insulators or insulators.
(iii) Semiconductor : Those substances for which the value of forbidden energy gap between valence band and conduction band is around 1 eV , they are called semiconductor materials.
(i) Conductors: Those substances for which the forbidden energy gap $\Delta E$ is almost zero, are called conductors. In these the valence band and conduction band overlap each other.
(ii) Insulators: Those substances for which the value of forbidden energy gap $\Delta E g$ situated between the valence band and conduction band is 6 eV or more, are called insulators or insulators.
(iii) Semiconductor : Those substances for which the value of forbidden energy gap between valence band and conduction band is around 1 eV , they are called semiconductor materials.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
More "3 Marks Question" from Semiconductor Electronics: Materials, Devices and Simple Circuits→Semiconductor Electronics: Materials, Devices and Simple Circuits — all question types→Physics STD 12 Science question papers→Gujarat Board STD 12 Science question papers→Gujarat Board question paper generator→
Similar questions
An electromagnetic wave of wavelength $\lambda$ is incident on a photosensitive surface of negligible work function. If the photoelectrons emitted from the surface have the same de Broglie wavelength $\lambda\text{B,}$ prove that $\lambda=\Big(\frac{2\text{mc}}{\text{h}}\Big)\lambda^2_\text{B}.$
→If a charge is placed at rest in an electric field, will its path be along a line of force? Discuss the situation when the lines of force are straight and when they are curved.
A steel wire of length 64cm weighs 5g. If it is stretched by a force of 8N, what would be the speed of a transverse wave passing on it?
A long, straight wire carrying a current of 1.0A is placed horizontally in a uniform magnetic field B = 1.0 × 10-5T pointing vertically upward figure. Find the magnitude of the resultant magnetic field at the points Pand Q, both situated at a distance of 2.0cm from the wire in the same horizontal plane.
Find the charge on the capacitor shown in figure.
What should be the distance between the object in Exercise 9.30 and the magnifying glass if the virtual image of each square in the figure is to have an area of 6.25 mm2. Would you be able to see the squares distinctly with your eyes very close to the magnifier?
The two wires shown in are made of the,
same material which has a breaking stress of 8 × 108N/m2. The area of cross-section of the upper wire is 0.006cm2 and that of the lower wire is 0.003cm2. The mass m1 = 10kg, m2 = 20kg and the hanger is light:
same material which has a breaking stress of 8 × 108N/m2. The area of cross-section of the upper wire is 0.006cm2 and that of the lower wire is 0.003cm2. The mass m1 = 10kg, m2 = 20kg and the hanger is light:
- Find the maximum load that can be put on the hanger without breaking a wire. Which wire will break first if the load is increased?
- Repeat the above part if m1 = 10kg and m2 = 36kg.
- State the condition under which a charged particle moving with velocity v goes undeflected in a magnetic field B.
- An electron, after being accelerated through a potential difference of 104 V, enters a uniform magnetic field of 0.04 T, perpendicular to its direction of motion. Calculate the radius of curvature of its trajectory.
A closely wound solenoid of 2000 turns and area of cross-section 1.6 × 10–4 m2, carrying a current of 4.0 A, is suspended through its centre allowing it to turn in a horizontal plane.
- What is the magnetic moment associated with the solenoid?
- What is the force and torque on the solenoid if a uniform horizontal magnetic field of 7.5 × 10–2 T is set up at an angle of 30º with the axis of the solenoid?
- An X-ray tube produces a continuous spectrum of radiation with its short wavelength end at 0.45 Å. What is the maximum energy of a photon in the radiation?
- From your answer to (a), guess what order of accelerating voltage (for electrons) is required in such a tube?