College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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Plz I need the correct answer of this questions all branch in electronics
Transcribed Image Text:Introduction to Optoelectronic Devices
7- LED emits light of a certain color depending on
a. Construction of LED, that is physical dimensions.
b. Number of available carriers.
c. Type of semiconductor material used.
d. Number of recombination that takes place.
8- The advantage of LED is
a. Long life
b. Fast on-off switching
c. Low operating voltage
d. All of the above
Mustansiriyah University
College of Science
Electronics I
Summer Semester 2020/2021
Physics Department
Dr. Emad Aljaberi
Introduction to Optoelectronic Devices
9- If an LED is forward biased, it emits light due to
a. Recombination of carriers
b. Light generated in breaking the covalent bonds
c. Light produced by collisions
d. All of the above reasons
10- LED has an advantage of
a. Long life
b. Fast on-off switching
c. Low operating voltage
d. All of the above
Mustansiriyah University
Electronics I
Physics Department
College of Science
Summer Semester 2020/2021
Dr. Emad Aljaberi
Introduction to Optoelectronic Devices
11- The LEDS made with GaAs emit light in the
a. Yellow region
b. Infrared region
c. Orange region
d. Red visible region
12- LED has an advantage of
a. Long life
b. Fast on-off switching
c. Low operating voltage
d. All of the above
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