Physics, 21.08.2019 20:30, southerntouch103
The peak in light emission from a light emitting diode (3d semiconductor) occurs approximately 1) at the photon energy that equals the energy peak of electrons in the conduction band minus the energy peak of holes in the valence band. (a) calculate the energy at which the electron distribution peaks above the lowest energy (bottom) of the conduction band? (4 marks) (b) what is the energy for which the hole distribution peaks below the highest energy (top) of the valence band? (1 mark) (c) estimate the peak emission wavelength (free-space) for gap that has a bandgap of 2.3 ev for t 300k? (3 marks) (d) if the temperature is increased by 50k, how much does the wavelength shift? (1 mark) (this question tests engineering attribute 1: apply simple quantum theory to determine the response of semiconductor, metal and insulator materials).
Answers: 2
Physics, 21.06.2019 17:00, cxttiemsp021
Which of the following is considered to be a vector? a. temperature b. velocity c. time d. mass
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Physics, 22.06.2019 09:30, smiley29162
Gasoline comes from petroleum, which is made from ancient living things. petroleum, therefore, contains a type of energy. a. heat b. nuclear c. biological d. chemical potential
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Physics, 22.06.2019 14:30, ayoismeisalex
Two carts, one of mass 2m and one of mass m, approach each other with the same speed, v. when the carts collide, they hook together. assume that positive momentum is to the right. which graph best represents the momentum of both carts over time, before and after the collision?
Answers: 3
The peak in light emission from a light emitting diode (3d semiconductor) occurs approximately 1) at...
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