Physics, 14.03.2020 04:23 beeboppity

Laser diode sources used in fiber optic communication systems operate at wavelengths around 1550 nm where the dispersion and loss of optical fibers is small. InP is the base material for laser diodes operating around 1550 nm. The bandgap of InP can be varied by replacing a fraction (x) of In lattice sites with Ga, and a fraction 25 (y) of P lattice sites with As; making the compound In1-xGaxAsyP1-y. The bandgap can be changed by varying x and y according to the formula Eg(y) [eV] = 1.35 – 0.72y + 0.12y2 for 0 y 1 and x/y = 0.45 What wavelength range does In1-xGaxAsyP1-y provide to laser diode manufacturers? Calculate the fractional amount of Ga, x, and the fractional amount of As, y, needed to produce a 1550 nm diode laser

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force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

$f\alpha \frac{dp}{dt}$

⇒ $f= k \frac{dp}{dt}$

here k is the proportionality constant whose value is 1.

$f=\frac{dp}{dt}$

$f= \frac{d[mv]}{dt}$

$f= m\frac{dv}{dt} +v\frac{dm}{dt}$

$f=ma+v\frac{dm}{dt}$ [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.

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float.

archimedes' principle

denser than water sinks in water.

denser than mercury would sink in it

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stands for electromotive force and it is measured in volts. despite its name, it is not actually the force in the sense of being a "pushing" or "pulling" (not measured in newtons).an equation that relates emf, ℰ, to a battery's terminal voltage, v, current, i, and internal resistance, r, is ℰ = v + irin this case, the emf can be interpreted as a voltage—a difference in electric potential.i would not say that it would be considered an energy. if emf can be defined as the energy/work per a unit charge from a battery or other electric source, then it is not strictly energy.

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Supply is the markets term for selling a specific quantity of products at various prices. the law of supply and demand is the one which affect the pricing and also the quantity the market is able to produce or make available.

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Laser diode sources used in fiber optic communication systems operate at wavelengths around 1550 nm...

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