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p-n photodiode is fabricated from a semiconductor with a band gap of 2.5eV. It can detect a signal of wavelength.

  • Option 1)

    4000nm

  • Option 2)

    6000nm

  • Option 3)

    4000A^{0}

  • Option 4)

    6000A^{\circ}

 

Answers (1)

best_answer

 

Photo diode -

A special type of photo detector.

- wherein

By measuring the change in the conductance of the semiconductors one can measure the intensity of the optical signal

 

 

\lambda = \frac{hc}{ev}= \frac{12400}{E(ev)}A^{^{\circ}}= \frac{12400}{2.5}=4960A^{^{\circ}}

\therefore \lambda = 4000 A^{^{\circ}}


Option 1)

4000nm

This option is incorrect

Option 2)

6000nm

This option is incorrect

Option 3)

4000A^{0}

This option is correct

Option 4)

6000A^{\circ}

This option is incorrect

Posted by

Aadil

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