1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
pav-90 [236]
3 years ago
12

Light of intensity I0 and polarized horizontally passes through three polarizes. The first and third polarizing axes are horizon

tal, but the second one is oriented 20.0� to the horizontal. In terms of I0, what is the intensity of the light that passes through the set of polarizers?
A) 0.442 I0
B) 0.180 I0
C) 0.780 I0
D) 0.883 I0
Physics
1 answer:
Alex17521 [72]3 years ago
3 0

Answer:

Option C.

Explanation:

Suppose that we have light polarized in some given direction with an intensity I0, and it passes through a polarizer that has an angle θ with respect to the polarization of the light, the intensity that comes out of the polarizer will be:

I(θ) = I0*cos^2(θ)

Ok, we know that the light is polarized horizontally and comes with an intensity I0

The first polarizer axis is horizontal, then the intensity after this polarizer is:

then θ = 0°

I(0°) = I0*cos^2(0°) = I0

The intensity does not change. The axis of polarization does not change.

The second polarizer is oriented at 20° from the horizontal, then the intensity that comes out of this polarizer is:

I(20°) =  I0*cos^2(20°) = I0*0.88

And the axis of polarization of the light that comes out is now 20° from the horizontal

Now the light passes through the last polarizer, which has an axis oriented horizontally, so the final intensity of the light will be:

note that here the initial polarization is  I0*0.88

and the angle between the axis is 20° again.

Then the final intensity is:

I(20°) =  I0*0.88*cos^2(20°) = I0*0.78

Then the correct option is C.

You might be interested in
What are the different kinds of forces?
Anon25 [30]
Gravity, friction, and air resistance are some examples.
6 0
3 years ago
Read 2 more answers
A pipe that is open at both ends has a fundamental frequency of 320 Hz when the speed of sound in air is 331 m/s.
fenix001 [56]

Question

What is the length of the pipe?

Answer:

(a) 0.52m

(b) f2=640 Hz and f3=960 Hz

(c) 352.9 Hz

Explanation:

For an open pipe,  the velocity is given by

v=\frac {2Lf}{n}

Making L the subject then

L=\frac {nV}{2f}

Where f is the frequency,  L is the length,  n is harmonic number,  v is velocity

Substituting 1 for n,  320 Hz for f and 331 m/s for v then

L=\frac {1*331}{2*320}=0.5171875\approx 0.52m

(b)

The next two harmonics is given by

f2=2fi

f3=3fi

f2=3*320=640 Hz

f3=3*320=960 Hz

Alternatively, f2=2\times \frac {v}{2L} and f3=3\times \frac {v}{2L}

f2=2\times \frac {331}{2*0.52}=636.5 Hz\\f3=3\times \frac {331}{2*0.52}=954.8 Hz

(c)

When v=367 m/s then

f1= \frac {v}{2L}\\f1= \frac {367}{2*0.52}=352.9 Hz

5 0
3 years ago
A 100-g toy car moves along a curved frictionless track. At first, the car runs along a flat horizontal segment with an initial
aleksandrvk [35]

Answer:

The final velocity of the car is 2.02 m/s

Explanation:

Hi there!

The kinetic energy of the car as it runs along the first flat horizontal segment can be calculated using the following equation:

KE = 1/2 · m · v²

Where:

KE =  kinetic energy

m = mass

v = velocity

Then, the initial kinetic energy will be:

KE = 1/2 · 0.100 kg · (2.77 m/s)²

KE = 0.384 J

When the car gains altitude, it gains potential energy. The amount of gained potential energy will be equal to the loss of kinetic energy. So let´s calculate the potential energy of the car as it reaches the top:

PE = m · g · h

Where:

PE = potential energy.

m = mass

g = acceleration due to gravity.

h = height.

PE = 0.100 kg · 9.8 m/s² · 0.184 m

PE = 0.180 J

Then, the final kinetic energy will be (0.384 J - 0.180 J) 0.204 J

Using the equation of kinetice energy, we can obtain the velocity of the car:

KE =  1/2 · m · v²

0.204 J = 1/2 · 0.100 kg · v²

2 · 0.204 J  / 0.100 kg = v²

v = 2.02 m/s

The final velocity of the car is 2.02 m/s

7 0
3 years ago
The acceleration of gravity is 9.8m/s2. How fast will an object be moving if it falls for three seconds?
Mice21 [21]

Answer:

Acceleration

\frac{distace}{time}

When we cross multiply, distance will be equal to acceleration multiply by time

Distance = acceleration x time

Distance = 9.8 x 3

= 29.4 m/s

7 0
2 years ago
Check My Work (1 remaining) Boron coated with SiC (or Borsic) reinforced aluminum containing aligned 20 vol% fibers is an import
Lubov Fominskaja [6]

Answer:

E = 12 * 10^{6} Psi

Explanation:

Modulus of Elasticity perpendicular to the fibre,

\frac{1}{E} = \frac{B_{B} }{E_{B} } + \frac{B_{Al} }{E_{Al} }

B_{B} = 20% = 0.2\\

B_{Al} = 80% = 0.8

E_{B} =55 * 10^{6} Psi

E_{Al} =10 * 10^{6} Psi

\frac{1}{E} = \frac{0.2 }{55 * 10^{6}  } + \frac{0.8 }{10 *10^{6} }

\frac{1}{E} = 8.36 * 10^{-8} \\E = \frac{1}{8.36 * 10^{-8} }\\E = 12 * 10^{6} Psi

3 0
3 years ago
Other questions:
  • A of mass 5.0 kilograms moving at 20. meters per second collides with ball B of unknown mass moving at 10. meters per second in
    9·1 answer
  • For a cars speedometer what is the calculated speed over an entire trip
    14·1 answer
  • The driver of a stationary car hears a siren of an approaching police car at a frequency of 280Hz. If the actual frequency of th
    13·1 answer
  • If you push a book against a wall hard enough it will not slide down even though gravity is pulling it. Use what you know about
    12·1 answer
  • Two point charges are fixed on the y axis: a negative point charge q1 = -34 μC at y1 = +0.18 m and a positive point charge q2 ar
    10·1 answer
  • 2. The components of vector A are given as follows:
    7·1 answer
  • What is true about X-rays and microwaves?
    12·1 answer
  • Which is a property of every<br> mixture?
    10·1 answer
  • AM and FM stand for two different processes that are used to code voices and music for transmission. What does AM stand for? 1.
    5·1 answer
  • Why does a magnet attract a steel nail
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!