Physics, 18.10.2019 06:30 izzysmith6836

A200 mw horizontally polarized laser beam passes through a polarizing filter whose axis is 25∘ from vertical.
what is the power of the laser beam as it emerges from the filter?
answer needs to be in mw

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Answer from: jordan7626

35.7 mW

Explanation:

The intensity of light after passing through a polarizer is given by

$I=I_0 cos^2 \theta$

where

I_0 is the initial intensity of the light

$\theta$ is the angle between the direction of polarization of the initial light and the transmission axis of the polarizing filter

Keeping in mind that the power is directly proportional to the intensity:

$P \propto I$

we can rewrite the previous equation as

$P=P_0 cos^2 \theta$

where we have

P_0 = 200 mW

$\theta=90^{\circ}-25^{\circ}=65^{\circ}$ (because the initial light is horizontally polarized, while the axis of the filter is 25 degrees from the vertical

So, the power of the laser beam emerging from the filter is

$P=(200 mW) cos^2 65^{\circ}=35.7 mW$

Answer from: Quest

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.

Answer from: Quest

Ohm's law tells you that i = v/r where v is equivalent voltage and r is equivalent resistance of the circuit
since all circuits have the same voltage, your question is really asking which circuit has the lowest total resistance, since the lower the resistance, the higher the current
circuit a has a resistance of 5 ohms; circuit c is in series so has a resistance of 10 ohms; circuit b is in parallel and therefore has a resistance of 2.5 ohms (review your notes on adding resistances in parallel and series); therefore b has the highest current

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A200 mw horizontally polarized laser beam passes through a polarizing filter whose axis is 25∘ from...