Question:
In energy band diagram of insulators, a band gap and the conduction band is respectively
In energy band diagram of insulators, a band gap and the conduction band is respectively
Show Hint
An insulator has a very wide forbidden gap and nothing in the conduction band.
Updated On: Oct 1, 2026
- very high, empty
- very low, empty
- very high, completely filed
- very low, partially filled
Show Solution
Verified By Collegedunia
The Correct Option is A
Solution and Explanation
Step 1: Recall the band picture
A solid has a valence band (filled with bound electrons) and a conduction band above it. The forbidden gap sits between them.
Step 2: Apply it to insulators
In an insulator the gap is very large, around 6 eV or more. Thermal energy at room temperature cannot lift electrons across it.
So the conduction band stays empty and no current flows.
Step 3: Other options
(B) and (D) say the gap is very low, which describes semiconductors or conductors. (C) says the conduction band is completely filled, which would make a conductor. Only (A) fits.
Final Answer:
Insulators have a very high band gap and an empty conduction band, option (A). \[ \boxed{\text{(A) very high, empty}} \]
A solid has a valence band (filled with bound electrons) and a conduction band above it. The forbidden gap sits between them.
Step 2: Apply it to insulators
In an insulator the gap is very large, around 6 eV or more. Thermal energy at room temperature cannot lift electrons across it.
So the conduction band stays empty and no current flows.
Step 3: Other options
(B) and (D) say the gap is very low, which describes semiconductors or conductors. (C) says the conduction band is completely filled, which would make a conductor. Only (A) fits.
Final Answer:
Insulators have a very high band gap and an empty conduction band, option (A). \[ \boxed{\text{(A) very high, empty}} \]
Was this answer helpful?
0
0
Top MHT CET Physics Questions
- In non uniform circular motion, the ratio of tangential to radial acceleration is (r = radius of circle, $v =$ speed of the particle, $\alpha =$ angular acceleration)
- A particle moves along a circle of radius ?$r$? with constant tangential acceleration. If the velocity of the particle is ?$?$? at the end of second revolution, after the revolution has started then the tangential acceleration is
- If $M_z$ = magnetization of a paramagnetic sample, $B$ = external magnetic field, $T$ = absolute temperature, $C$ = curie constant then according to Curie�s law in magnetism, the correct relation is
- In a fundamental mode, the time required for the sound wave to reach upto the closed end of a pipe filled with air is $'t'$ second. The frequency of vibration of air column is
- In a parallel plate capacitor, the capacity increases if
View More Questions
Top MHT CET band theory of solids Questions
- In semiconductors at room temperature,
- When the conductivity of a semiconductor is only due to the breaking of the covalent bonds, the semiconductor is called}
- For an intrinsic semiconductor ($n_h$ and $n_e$ are the number of holes per unit volume and number of electrons per unit volume respectively)
- Which of the following dopant is added in silicon to obtain n-type semiconductor?
- By increasing the temperature, the electrical conductivity of a conductor and a semiconductor,
View More Questions
Top MHT CET Questions
- During r- DNA technology, which one of the following enzymes is used for cleaving DNA molecule ?
- In non uniform circular motion, the ratio of tangential to radial acceleration is (r = radius of circle, $v =$ speed of the particle, $\alpha =$ angular acceleration)
- The temperature of $32^{\circ}C$ is equivalent to
- The line $5x + y - 1 = 0$ coincides with one of the lines given by $5x^2 + xy - kx - 2y + 2 = 0 $ then the value of k is
- The heat of formation of water is $ 260\, kJ $ . How much $ H_2O $ is decomposed by $ 130\, kJ $ of heat ?
View More Questions