(about LED)
In the case of light-emitting diodes that convert electrical
signals into light, what properties of light can be used? wave or
particle???
I know that its not corresponding to photoelectric
effect.
But Isn't the energy being released into the form of light a
particle of light? i mean does light-emitting diodes use or can be
explained by particle property of light???
Light in LEDs is produced by the phenomenon of electroluminescence,

(about LED) In the case of light-emitting diodes that convert electrical signals into light, what properties...
7 (a)* The Planck constant h can be measured in an experiment using light-emitting diodes LEDs) Each LED used in the experiment emits monochromatic light. Te wavelength λ of the emitted photons is detemined during the manufacturing process and is provided by the manufacturer When the p.d. across the LED reaches a specific minimum value suddenly switches on emitting photons of light of wavelength the LED andi are related by the energy equation eVi hh flying lead Fig. 7.1 LED...
Diodes can emit light. a) In a light emitting diode, what must be done electrically to cause the diode to emit light? How is the light emitted? b) What feature of the band gap is needed to make the LED emit light without much energy going into heat? c) Is the light from an LED produced primarily by spontaneous emission or stimulated emission? d) What feature of the LED determines the color of the light? e) What addition to an...
7. Diodes can emit light. a) In a light emitting diode, what must be done electrically to cause the diode to emit light? How is the light emitted? b) What feature of the band gap is needed to make the LED emit light without much energy going into heat? c) Is the light from an LED produced primarily by spontaneous emission or stimulated emission? d) What feature of the LED determines the color of the light? e) What addition to...
Experiment 11: Investigating Bandgap Energies, Materials, and Design of Light-Emitting Diodes (LED) 3. For a device to be a good conductor, there must be a significant electron population in the conduction band. When no energy is supplied to a semiconductor, the relative population of the conduction band follows Boltzmann's population law. In the case of a diode, the equation is: CB Population = e /RT VB Population Where CB and VB population are the respective electron populations in the conduc-...
17. The distance between an electron and a hole across a band gap following electronic excitation is called A. Bohr exciton radius B. Bohr radius C. quantum D. conduction band 18. When a photon strikes an atom, the energy is absorbed by A. a proton which moves to an excited state. B. a neutron which causes the nucleus to split. C. an electron which moves from the ground to an excited state. D. nothing. A photon is never absorbed by...
and manipulate being little spheres. We could try to combine these spheres and learn something about how elements combine to form compounds. PRE-LAB For a model such as the particle model of matter to be really useful, it has to offer us more than merely a convenient way of summarizing and accounting for facts we already know; a model must enable us to make predictions that can be tested 1) Here is an example of a very simple model and...
CASE: WENGART AIRCRAFT President Ralph Larsen of Wengart Aircraft has become increasingly concemed about profits. Though he is not mha te and about a dozen top company takeover, he does feel an obligation to maximize shareholders' return on their inv executives receive sizable stock bonuses, so it is to their advantage to obtain a high share price. Wengart manufactures private and military aircraft. It is number two in its industry, which consists of seven companies are ranked sixth. It is...
My
question is about the case study “ Comparing Apples and Oranges:
which group yuelds the best profit?”
1) Using the Excel apreadsheet attached to complete the rooms
sold and revenue projections based on the above case study.
Case Study: "Comparing Apples and Oranges: Which Group Yields
the Best Profit?"
The Diamond Peak Hotel, one of 45 hotels in the Host Marriott
management company, was bustling with business this Thursday
afternoon as the hour of the daily revenue meeting drew...
Please see the articles below… 1. What is your opinion on the subject? 2. Which ethical views (i.e., utilitarian view, moral rights view, justice view, practical view) you feel are being used by both sides of the argument (i.e., for and against downloading) to justify their positions? High Court Enters File-Sharing Spat; Justices Must Determine Software Providers' Liability For Copyright Violations by Anne Marie Squeo. Wall Street Journal. (Eastern edition). New York, N.Y.: Mar 30, 2005. pg. A.2 WASHINGTON -- The Supreme...
In your judgement, and given only the facts described in this
case, should the management of Massey energy Company be held
morally responsible for the deaths of the 29 miners? Explain in
detail.
Suppose that nothing more is learned about the explosion other
than what is described in this case. Do you think Don Blankership
should be held morally responsible for the deaths of the 29 miners?
Explain in detail.
Given only the facts described in this case, should the...