English

Which one of the following elements will require the highest energy to take out an electron from them? Pb, Ge, C and Si - Physics

Advertisements
Advertisements

Question

Which one of the following elements will require the highest energy to take out an electron from them?

Pb, Ge, C and Si

Options

  • Ge

  • C

  • Si

  • Pb

MCQ

Solution

C

Explanation:

Since carbon forms a covalent bond and is the first element in its group, it requires the most energy of any element to remove electrons from it.

shaalaa.com
  Is there an error in this question or solution?
2022-2023 (March) Outside Delhi Set 2

RELATED QUESTIONS

Write two characteristic features to distinguish between n-type and p-type semiconductors ?


When an electron goes from the valence band to the conduction band in silicon, its energy is increased by 1.1 eV. The average energy exchanged in a thermal collision is of the order of kT which is only 0.026 eV at room temperature. How is a thermal collision able to take some to the electrons from the valence band to the conduction band?


Suppose the energy liberated in the recombination of a hole-electron pair is converted into electromagnetic radiation. If the maximum wavelength emitted is 820 nm, what is the band gap?

(Use Planck constant h = 4.14 × 10-15 eV-s, Boltzmann constant k = 8·62 × 10-5 eV/K.)


The conductivity of a pure semiconductor is roughly proportional to T3/2 eΔE/2kT where ΔE is the band gap. The band gap for germanium is 0.74 eV at 4 K and 0.67 eV at 300 K. By what factor does the conductivity of pure germanium increase as the temperature is raised from 4 K to 300 K?


The product of the hole concentration and the conduction electron concentration turns out to be independent of the amount of any impurity doped. The concentration of conduction electrons in germanium is 6 × 1019 per cubic metref conduction electrons increases to 2 × 1023 per cubic metre. Find the concentration of the holes in the doped germanium.. When some phosphorus impurity is doped into a germanium sample, the concentration o


With reference to Semiconductor Physics,

Draw a labelled energy band diagram for a semiconductor.


What is forbidden band?


Three photo diodes D1, D2 and D3 are made of semiconductors having band gaps of 2.5 eV, 2 eV and 3 eV, respectively. Which 0 ones will be able to detect light of wavelength 6000 Å?


  • Assertion (A): In insulators, the forbidden gap is very large.
  • Reason (R): The valence electrons in an atom of an insulator are very tightly bound to the nucleus.

With reference to semiconductor physics, answer the following question.

What is meant by “Forbidden band" of energy levels?


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×