Electronics and Experimental Methods-Opto-Electronic Devices (CSIR (Council of Scientific & Industrial Research) Physical Sciences): Questions 6 - 7 of 7

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Question number: 6

» Electronics and Experimental Methods » Opto-Electronic Devices » Solar Cells

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Appeared in Year: 2011

MCQ▾

Question

Monochromatic light of wavelength and intensity falls on a solar cell of area . The conversion efficiency of the solar cell is 10%. If each converted photon results in an electron – hole pair, what is the maximum circuit current supplied by the solar cell?

(Take , and ) (December)

Choices

Choice (4)Response

a.

b.

c.

d.

Question number: 7

» Electronics and Experimental Methods » Opto-Electronic Devices » LEDs

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Appeared in Year: 2016

MCQ▾

Question

The active medium in a blue LED (light emitting diode) is a alloy. The band gaps of and are and respectively. If the band gap of varies approximately linearly with , the value of required for the emission of blue light of wavelength is (take ) (December)

Choices

Choice (4)Response

a.

0.75

b.

0.33

c.

0.95

d.

0.50

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