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The electrical conductivity of a semiconductor increases.
when em radiation of wavelength shorter than 2480 nm is incident on it. The band gap (in eV) for the semiconductor is
  • a)
    0.9
  • b)
    0.7
  • c)
    0.5
  • d)
    1.1
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
The electrical conductivity of a semiconductor increases.when em radia...


Band Gap and Electrical Conductivity of Semiconductors

Band gap is the energy difference between the top of the valence band and the bottom of the conduction band in a semiconductor. It determines the electrical conductivity of the material.

Impact of EM Radiation on Semiconductors

When electromagnetic (EM) radiation with a wavelength shorter than 2480 nm is incident on a semiconductor, it can excite electrons from the valence band to the conduction band, causing them to become free charge carriers. This increases the electrical conductivity of the semiconductor.

Identifying the Band Gap

To determine the band gap of the semiconductor in question, we can use the fact that it exhibits increased electrical conductivity when exposed to EM radiation with wavelengths shorter than 2480 nm. Based on this behavior, we can infer that the band gap must be less than the energy corresponding to 2480 nm.

Correct Answer and Explanation

Among the given options, option C (0.5 eV) is the most suitable choice for the band gap of the semiconductor. This value is lower than the energy associated with EM radiation of 2480 nm, which aligns with the observed increase in electrical conductivity when exposed to such radiation. Therefore, option C is the correct answer for this scenario.
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The electrical conductivity of a semiconductor increases.when em radiation of wavelength shorter than 2480 nm is incident on it. The band gap (in eV) for the semiconductor isa)0.9b)0.7c)0.5d)1.1Correct answer is option 'C'. Can you explain this answer?
Question Description
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