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nadezda [96]
3 years ago
6

Polarization: Unpolarized light passes through three ideal polarizing filters. The first filter is oriented with a horizontal tr

ansmission axis, the second one has its transmission axis at 30° from the horizontal, and the third filter has a vertical transmission axis. What percent of the light gets through this combination?
Engineering
1 answer:
GaryK [48]3 years ago
8 0

Answer:

the percentage of light that gets through this combination is 9.38

Explanation:

Given the data in the question;

Let us represent the incident unpolarized light with I_0.

So, the amount of light intensity passing through the first polarizer will be;

I_1 = I_0 / 2 ------ let this be equation 1

An the amount of light intensity passing through the second polarizer will be;

I_2 = I_1cos²θ

given that; the second one has its transmission axis at 30°

so, we substitute;

I_2 = I_1 × cos²( 30° )

I_2 = I_1 × 0.75

I_2 = 0.75I_1

from equation; I_1 = I_0 / 2

I_2 = 0.75( I_0 / 2 )

I_2 = 0.375I_0 .

Now, the amount of light intensity passing through the third polarizer will be;

I_3 = I_2cos² ( 90° - 30° )

I_3 = I_2 × cos²( 60° )

I_3 = I_2  × 0.25

we substitute

I_3 = 0.375I_0  × 0.25

I_3 = 0.09375I_0

∴ I_3/I_0 × 100 = 0.09375 × 100

⇒ 9.38%

Therefore, the percentage of light that gets through this combination is 9.38

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Explanation:

A 75- kw, 3-, Y- connected, 50-Hz 440- V cylindrical synchronous motor operates at rated condition with 0.8 p.f leading. the motor efficiency excluding field and stator losses, is 95%and X=2.5ohms. calculate the mechanical power developed, the Armature current, back e.m.f, power angle and maximum or pull out torque of the motor

A 75- kw, 3-, Y- connected, 50-Hz 440- V cylindrical synchronous motor operates at rated condition with 0.8 p.f leading. the motor efficiency excluding field and stator losses, is 95%and X=2.5ohms. calculate the mechanical power developed, the Armature current, back e.m.f, power angle and maximum or pull out torque of the motor

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3 years ago
Discuss three objectives of Tariff and elaborate on three characteristics of it
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Answer:

Three objectives of a tariff are

1) To control trade between countries

2) To protect domestic industries

3) To provide a source of income

Three characteristics of a tariff are;

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Explanation:

A tariff is an import or export tax placed on goods traded between countries, it serves to control the foreign trade between the two countries and to protect or develop local industry

A Tariff is an important source of income to countries

Three characteristics of a tariff are;

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Proper return from the consumer should be factored in a tariff to account for the alternatives or normal expense pattern

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A banana plug is named for its resemblance to the shape of a banana. They are wider in the middle of the plug, and narrower at the top and bottom. The banana plug can be easily plugged or unplugged into the ports of speaker or receiver.

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3 years ago
A consolidation test was performed on a sample of fine-grained soil sample taken from a depth such that the vertical effective s
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Answer:

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