Question
In: Physics
10.How does a light-emitting diode work? Why are there different colors of LEDs?
10.How does a light-emitting diode work? Why are there different colors of LEDs?
Solutions
genius_generous answered 2 years agoRelated Solutions
Light emitting diode (LEDs) light bulbs have become required in recent years, but do they make...
Light emitting diode (LEDs) light bulbs have become required in
recent years, but do they make financial sense? Suppose a typical
60-watt incandescent light bulb costs $.49 and lasts for 1,000
hours. A 15-watt LED, which provides the same light, costs $3.60
and lasts for 12,000 hours. A kilowatt hour of electricity costs
$.125. A kilowatt-hour is 1,000 watts for 1 hour. However,
electricity costs actually vary quite a bit depending on location
and user type. An industrial user in...
Light emitting diode (LEDs) light bulbs have become required in recent years, but do they make...
Light emitting diode (LEDs) light bulbs have become required in
recent years, but do they make financial sense? Suppose a typical
60-watt incandescent light bulb costs $.54 and lasts for 1,000
hours. A 15-watt LED, which provides the same light, costs $3.85
and lasts for 12,000 hours. A kilowatt hour of electricity costs
$.130. A kilowatt-hour is 1,000 watts for 1 hour. However,
electricity costs actually vary quite a bit depending on location
and user type. An industrial user in...
what is a zener diode? why is it used? how does it work? what is the...
what is a zener diode? why is it used? how does it work? what is
the benefit of using a zener diode?
Consider a diffraction grating with 600 lines per millimeter. Light from a light–emitting diode at λ...
Consider a diffraction grating with 600 lines per millimeter.
Light from a light–emitting diode at λ = 830 nm with a bandwidth of
±10 nm is passed through a slit and a lens where it is collimated
onto the grating at an angle of incidence of -5 degrees.
a. What is the range of angles in degrees to which the light is
diffracted?
b. To make a spectrometer, I would like to place a camera chip
with a 1–by– 1200...
Light emitting diode (LED) light bulbs have become required in recent years, but do they make...
Light emitting diode (LED) light bulbs have become required in
recent years, but do they make financial sense? Suppose a typical
60-watt incandescent light bulb costs $.46 and lasts for 1,000
hours. A 15-watt LED, which provides the same light, costs $3.45
and lasts for 12,000 hours. A kilowatt-hour is 1,000 watts for 1
hour. Suppose you have a residence with a lot of incandescent bulbs
that are used on average 500 hours a year. The average bulb will be...
Light emitting diode (LED) light bulbs have become required in recent years, but do they make...
Light emitting diode (LED) light bulbs have become required in
recent years, but do they make financial sense? Suppose a typical
60-watt incandescent light bulb costs $.53 and lasts for 1,000
hours. A 15-watt LED, which provides the same light, costs $3.80
and lasts for 12,000 hours. A kilowatt-hour is 1,000 watts for 1
hour. Suppose you have a residence with a lot of incandescent bulbs
that are used on average 500 hours a year. The average bulb will be...
Light-emitting diode (LED) light bulbs have become required in recent years, but do they make financial...
Light-emitting diode (LED) light bulbs have become required in
recent years, but do they make financial sense? Suppose a typical
60-watt incadescent light bulb costs $.45 and lasts for 1,000
hours. A 7-watt LED, which provides the same light, costs $2.25 and
lasts for 40,000 hours. A kilowatt-hour of electricity costs $.121,
which is about the national average. A kilowatt-hour is 1,000 watts
for 1 hour. Suppose you have a residence with a lot of incandescent
bulbs that are used...
Payback Period and IRR of a Cost Reduction Proposal-Differential Analysis A light-emitting diode (LED) is a...
Payback Period and IRR of a Cost Reduction
Proposal-Differential Analysis
A light-emitting diode (LED) is a semiconductor diode that emits
narrow-spectrum light. Although relatively expensive when compared
to incandescent bulbs, they use significantly less energy and last
six to ten times longer, with a slow decline in performance rather
than an abrupt failure.
Metropolitan City currently has 80,000 incandescent bulbs in
traffic lights at approximately 12,000 intersections. It is
estimated that replacing all the incandescent bulbs with LED will
cost...
The city of Metropolis is considering replacing incandescent bulbs in traffic lights with light-emitting diode (LED)...
The city of Metropolis is considering replacing incandescent
bulbs in traffic lights with light-emitting diode (LED) lights
because they use significantly less energy and last much longer
without abrupt failure. Currently Metropolis has 80,000
incandescent bulbs in traffic lights at approximately 12,000
intersections. It is estimated that replacing all the incandescent
bulbs with LED will cost $46.02 million. However, the investment is
also estimated to save the city $8.85 million per year in energy
costs. Answer the following questions on...
Imagine shooting various colors of light at different kinds of metals. Depending on the work function...
Imagine shooting various colors of light at different kinds of
metals. Depending on the work function of each metal, the light
will or will not have enough energy to knock of an electron. (a)
Which of the following metals will NOT emit electrons when visible
light (with wavelengths of 380 nmto 700 nm) shines on them? (b) If
visible light can cause the metal to emit electrons, specific if
electrons will be emitted when red (685 nm) light is used,...
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