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The electrical conductivity of a semicon...

The electrical conductivity of a semiconductor increases when electromagnetic radiation of wavelength shorter than `1240 nm` is incident on it. The forbidden band energy for the semi conductor is (in eV).

A

`0.5`

B

`0.97`

C

`0.7`

D

`1.1`

Text Solution

Verified by Experts

The correct Answer is:
B
`E=(hc)/(lamda)=(12000)/(12400 Å)(e_(v)), 2.n_(e) gt n_(h)`.
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Knowledge Check

  • The electrical conductivity of a semiconductor increases when electromagnetic radiation of wavelength shorter than 2480 nm is incident on it. The band gap in (eV) for the semiconductor is.

    A
    `0.7 eV`
    B
    `0.5 eV`
    C
    `2.5 eV`
    D
    `1.2 eV`

  • The electrical conductivity of a semiconductor increases when electromagnetic radiation of wavelength shorter than 2480 nm is incident on it. The band gap of the semiconductor is

    A
    `0.3 eV`
    B
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    C
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    D
    `1.1 eV`

  • The electricity conductivity of a semiconductor increases when electromagnetic radiation of wavelength shorter than 2480nm is incident on it. The band gap (in eV) for the semiconductor is

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    B
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