Question 1 Polaroid Vision in a Spider Experiments show that the ground spider D

Question

Question 1

Polaroid Vision in a Spider Experiments show that the ground spider Drassodes cupreus uses one of its several pairs of eyes as a polarization detector. In fact, the two eyes in this pair have polarization directions that are at right angles to one another. Suppose linearly polarized light with an intensity of 800 W/m2 shines from the sky onto the spider, and that the intensity transmitted by one of the polarizing eyes is 222 W/m2 .

Part A

For this eye, what is the angle between the polarization direction of the eye and the polarization direction of the incident light?

Part B

What is the intensity transmitted by the other polarizing eye?

Question 2

The magnetic field in an electromagnetic wave has a peak value given by B = 5.0 T .

Part A

For this wave, find the peak electric field strength.

Part B

Find the average intensity.

Question 3

Calculate the following two into nanometers

4.23×1014

6.00×107   m

4.23×1014

Explanation / Answer

by using malus law

I = Io*cos^2(theta)

222 = 800*cos^2theta

costheta = sqrt(222/800)

theta = 58.21 degree

part b )

from other eye

theta = 90-58.21

I = 800* cos^2(90-58.21)

I = 578 W/m^2

Question 2 )

part a )

E = cB

E = 1.5 x 10^3 V/m

part b )

Iavg = c*Brms^2/uo

Brms = Bmax/sqrt(2)

Iavg = c*Bmax^2/2uo

uo = 4pi * 10^-7

c = speed of light

Iavg = 2.984 x 10^3 W/m^2

question 3 )

4.23 x 10^-14 m = 4.23 x 10^-5 nm

6.00 x 10^-7 m = 600 x 10^-9 m = 600 nm

Related Questions

Navigate

• Browse (All)
• Browse Q
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.