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see wavelength=1.24/Band gap energy this wavelength is in micrometer.so accordingly ans will be=1.24/1.42=0.873micrometer I think u had appeared in BSNL JTO. How many u attempted?? Vijay
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Give some Examples of direct and indirect band gap semiconductors?
direct band gap-semiconductor in which the bottom of the conduction band and the top of the valence band occur at the momentum k=0;in the case of d.b.s. energy released during band-to-band electron recombination with a hole is converted primarily into radiation (radiant recombination); wavelength of emitted radiation is determined by the energy gap of semiconductor; examples of d.b.s. GaAs, InP, ZnS, ZnSs, CdS, CdSe etc. indirect bandgap semiconductor --semiconductor in which bottom of the conduction band does not occur at effective momentum k=0, i.e. is shifted with respect to the top of the valence band which occurs at k=0; energy released during electron recombination with a hole is converted primarily into phonon; e.g. Si, Ge, GaP, GaAsp ,Ge etc, .
What is the voltage threshold for GAAs?
1.7 volts
What type of diode exhibits negative resistance?
A Tunneldiode, usually made of GaAS. In a part of its curve it has a negative resistance. This means that when you increase the voltage in that region, the current will drop.
Who invented LED?
In the fall of 1961, while working at Texas Instruments Inc., James R. Biard and Gary E. Pittman found that gallium arsenide (GaAs) emitted infrared light when electric current was applied. On Aug. 8th, 1962, Biard and Pittman filed a patent based on their findings titled "Semiconductor Radiant Diode" (U.S. Patent US3293513). After establishing the priority of their work based on engineering notebooks predating submissions from G.E. Labs, RCA Research Labs, IBM Research Labs, Bell Labs, and Lincoln Labs at MIT, the U.S. patent office issued the two inventors the first patent for the infrared (IR) light-emitting diode, the first modern LED. After filing the patent, Texas Instruments immediately began a project to manufacture infrared diodes. They announced the first commercial LED product (the SNX-100) in October of 1962.
What is the population of Gaas?
Gaas's population is 450.
What is the area of Gaas?
The area of Gaas is 9,130,000.0 square meters.
Is GaAs ionic?
No GaAs is a semiconductor- and as such is essentially a covalent compound.
Which type of band gap does GaAs have?
Gallium Arsenide (GaAs) has a 2.5eV band gap (@ 295 K)
What is kerosene in tagalog?
Kerosene in Tagalog is "petrolyo" or "kerosina."
Why GaAs is preferred to Si for high temperature operation of semi-conductor device?
GaAs has high mobility compare to Si
What is the name of GaAs?
Gallium Arsenic
What type of bond is GaAs?
ionic
Give some Examples of direct and indirect band gap semiconductors?
direct band gap-semiconductor in which the bottom of the conduction band and the top of the valence band occur at the momentum k=0;in the case of d.b.s. energy released during band-to-band electron recombination with a hole is converted primarily into radiation (radiant recombination); wavelength of emitted radiation is determined by the energy gap of semiconductor; examples of d.b.s. GaAs, InP, ZnS, ZnSs, CdS, CdSe etc. indirect bandgap semiconductor --semiconductor in which bottom of the conduction band does not occur at effective momentum k=0, i.e. is shifted with respect to the top of the valence band which occurs at k=0; energy released during electron recombination with a hole is converted primarily into phonon; e.g. Si, Ge, GaP, GaAsp ,Ge etc, .
What is the voltage threshold for GAAs?
1.7 volts
What are the chemical compounds for GAAs?
Gallium Arsenic
What gaas mean?
Gaelic Athletic Association
