A Ga andndash; As LED has a refractive index of 3.6 and is surrounded by air (andmu; = 1). If the bandgap of Ga andndash; As is 1.43. Then out of 500 photons generated in Ga andndash; As The number of photons emitted out of the specimen are _____Correct answer is '9'. Can you explain this answer? - EduRev Electronics and Communication Engineering (ECE) Question

Explore Courses UPSC Exam UPSC Test Series Free Notes EduRev Infinity

Open App

Electronics and Communication Engineering (ECE) Exam > Electronics and Communication Engineering (ECE) Questions > A Ga – As LED has a refractive index of...

Join the Discussion on the App

A Ga – As LED has a refractive index of 3.6 and is surrounded by air (μ = 1). If the bandgap of Ga – As is 1.43. Then out of 500 photons generated in Ga – As The number of photons emitted out of the specimen are _____

Correct answer is '9'. Can you explain this answer?

FREE This question is part of

Test: Electronic Devices - 6

Attempt Test

Attempt this Test

Verified Answer

A Ga – As LED has a refractive index of 3.6 and is surrounded by...

The external quantum efficiency is given by the relation

η_s = 3.6

η_a = 1

η_ext = 0.0193

Out of every 100 photons generated in Ga – As, only 1.93 are emitted out of the specimen.

for 500 photons → 9.5 emitted

Taking greatest integer value

[9.5] = 9

View all questions of this test

View all answers Start learning for free

< Previous Question Next Question >

Explore Courses for Electronics and Communication Engineering (ECE) exam

Similar Electronics and Communication Engineering (ECE) Doubts

A Germanium sample of dimensions 1 cm x 1 cm is illuminated with a 20 mW, 600 nm laser light source as shown in the figure. The illuminated sample surface has a 100 nm of loss-less Silicon dioxide layer that reflects one-fourth of the incident light. From the remaining light, one-third of the power is reflected from the Silicon dioxide-Germanium interface, one-third is absorbed in the Germanium layer, and one-third is transmitted through the other side of the sample. If the absorption coefficient of Germanium at 600 nm is 3 x 104 cm-1 and the bandgap is 0.66 eV, the thickness of the Germanium layer, rounded off to 3 decimal places, is ______ μm. Correct answer is between '0.230,0.232'. Can you explain this answer?

View answer

If one makes an LED in a semiconductor with a direct bandgap of 2.5eV, the wavelength of light emitted will be ________μm. (Given, Planck’s constant is 6.626x10-34 J-s and velocity of light is 3x108 m/s) Correct answer is between '0.49,0.5'. Can you explain this answer?

View answer

A germanium sample of dimensions 1 cm × 1 cm is illuminated with a 20 mW, 600 nm laser light source as shown in the figure. The illuminated sample surface has a 100 nm of loss-less Silicon dioxide layer that reflects one-fourth of the incident light. From the remaining light, one-third of the power is reflected from the Silicon dixodieGermanium interface, one-third is absorbed in the Germanium layer, and one-third is transmitted through the other side of the sample. If the absorption coefficient of Germanium at 600 nm is 3 × 104 cm-1 and the bandgap is 0.66 eV, the thickness of the Germanium layer, rounded off to 3 decimal places, is _________ μm. Correct answer is '0.231'. Can you explain this answer?

View answer

The figure shows a spot of light of uniform intensity 50 W/m2 and size 10 mm × 10 mm incident at the exact center of a photo-detector, comprising two identical photo-diodes D1 and D2. Each diode has a sensitivity of 0.4 A/W and is operated in the photoconductive mode. If the spot of light is displaced upwards by 100 μm, the resulting difference between the photocurrents generated by D1 and D2 in micro amperes, is __________ μA. Correct answer is '40'. Can you explain this answer?

View answer

Consider a long rectangular bar of direct bandgap p-type semiconductor. The equilibrium hole density is 1017 cm-3 the intrinsic carrier concentration is 1010 cm-3 . Electron and hole diffusion lengths are 2μm and 1μm , respectively. The left side of the bar ( x = 0) is uniformly illuminated with a laser having photon energy greater than the bandgap of the semiconductor. Excess electron-hole pairs are generated ONLY at x = 0 because of the laser. The steady state electron density at x = 0 is 1014 cm-3 due to laser illumination. Under these conditions and ignoring electric field, the closest approximation (among the given options) of the steady state electron density at x = 2μm , is

View answer

Top Courses for Electronics and Communication Engineering (ECE)View all

GATE ECE (Electronics) Mock Test Series 2025

Network Theory (Electric Circuits)

General Aptitude for GATE

Crash Course: Electronic Communication Engineering (ECE)

Signals and Systems

Top Courses for Electronics and Communication Engineering (ECE)

View all

Share with a Friend

Answer this doubt

Question Description
A Ga – As LED has a refractive index of 3.6 and is surrounded by air (μ = 1). If the bandgap of Ga – As is 1.43. Then out of 500 photons generated in Ga – As The number of photons emitted out of the specimen are _____Correct answer is '9'. Can you explain this answer? for Electronics and Communication Engineering (ECE) 2024 is part of Electronics and Communication Engineering (ECE) preparation. The Question and answers have been prepared according to the Electronics and Communication Engineering (ECE) exam syllabus. Information about A Ga – As LED has a refractive index of 3.6 and is surrounded by air (μ = 1). If the bandgap of Ga – As is 1.43. Then out of 500 photons generated in Ga – As The number of photons emitted out of the specimen are _____Correct answer is '9'. Can you explain this answer? covers all topics & solutions for Electronics and Communication Engineering (ECE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A Ga – As LED has a refractive index of 3.6 and is surrounded by air (μ = 1). If the bandgap of Ga – As is 1.43. Then out of 500 photons generated in Ga – As The number of photons emitted out of the specimen are _____Correct answer is '9'. Can you explain this answer?.

Solutions for A Ga – As LED has a refractive index of 3.6 and is surrounded by air (μ = 1). If the bandgap of Ga – As is 1.43. Then out of 500 photons generated in Ga – As The number of photons emitted out of the specimen are _____Correct answer is '9'. Can you explain this answer? in English & in Hindi are available as part of our courses for Electronics and Communication Engineering (ECE). Download more important topics, notes, lectures and mock test series for Electronics and Communication Engineering (ECE) Exam by signing up for free.

Here you can find the meaning of A Ga – As LED has a refractive index of 3.6 and is surrounded by air (μ = 1). If the bandgap of Ga – As is 1.43. Then out of 500 photons generated in Ga – As The number of photons emitted out of the specimen are _____Correct answer is '9'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of A Ga – As LED has a refractive index of 3.6 and is surrounded by air (μ = 1). If the bandgap of Ga – As is 1.43. Then out of 500 photons generated in Ga – As The number of photons emitted out of the specimen are _____Correct answer is '9'. Can you explain this answer?, a detailed solution for A Ga – As LED has a refractive index of 3.6 and is surrounded by air (μ = 1). If the bandgap of Ga – As is 1.43. Then out of 500 photons generated in Ga – As The number of photons emitted out of the specimen are _____Correct answer is '9'. Can you explain this answer? has been provided alongside types of A Ga – As LED has a refractive index of 3.6 and is surrounded by air (μ = 1). If the bandgap of Ga – As is 1.43. Then out of 500 photons generated in Ga – As The number of photons emitted out of the specimen are _____Correct answer is '9'. Can you explain this answer? theory, EduRev gives you an ample number of questions to practice A Ga – As LED has a refractive index of 3.6 and is surrounded by air (μ = 1). If the bandgap of Ga – As is 1.43. Then out of 500 photons generated in Ga – As The number of photons emitted out of the specimen are _____Correct answer is '9'. Can you explain this answer? tests, examples and also practice Electronics and Communication Engineering (ECE) tests.

Explore Courses for Electronics and Communication Engineering (ECE) exam