Electronics and Experimental Methods-Opto-Electronic Devices (CSIR (Council of Scientific & Industrial Research) Physical Sciences): Questions 5 - 7 of 7

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Passage

Light of wavelength 660 nm and power of Equation is incident on a semiconductor photodiode with an absorbing layer of thickness of Equation .

Question number: 5 (2 of 2 Based on Passage) Show Passage

» Electronics and Experimental Methods » Opto-Electronic Devices » Photo-Detectors

MCQ▾

Question

If the absorption coefficient at this wavelength is Equation and if Equation power is lost on reflection at the surface, the power absorbed will be –

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

Question number: 6

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

Appeared in Year: 2011

MCQ▾

Question

Monochromatic light of wavelength Equation and intensity Equation falls on a solar cell of area Equation . 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 Equation , Equation and Equation ) (December)

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

Question number: 7

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

Appeared in Year: 2016

MCQ▾

Question

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

Choices

Choice (4) Response

a.

0.50

b.

0.33

c.

0.75

d.

0.95

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