hw18 - homework 18 – LIN KEVIN – Due May 5 2008 4:00 am...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: homework 18 – LIN, KEVIN – Due: May 5 2008, 4:00 am 1 Question 1, chap 33, sect 3. part 1 of 1 10 points An unpolarized light beam with intensity of I passes through 2 polarizers shown in the picture. I 44 ◦ 74 ◦ I If the first polarizer is rotated at an angle of 44 ◦ with respect to vertical and the sec- ond at an angle 74 ◦ with respect to vertical, what is the beam intensity I after the second polarizer? 1. I = 1 16 I 2. I = 7 16 I 3. I = 5 16 I 4. I = 3 16 I 5. I = 1 8 I 6. I = 1 4 I 7. I = 1 2 I 8. I = 3 8 I 9. I = 9 16 I 10. I = 5 8 I Question 2, chap 33, sect 5. part 1 of 1 10 points At what distance from a 65 W electromag- netic wave point source (like a light bulb) is the amplitude of the electric field 8 V / m? All quantities given here are in the SI units. Answer in units of m. Question 3, chap 33, sect 5. part 1 of 1 10 points A 28 kW beam of radiation is incident nor- mally on a surface that reflects half of the radiation. The speed of light is 3 × 10 8 m / s. What is the force on this surface? Answer in units of mN. Question 4, chap 33, sect 5. part 1 of 1 10 points Consider a monochromatic electromagnetic plane wave propagating in the y direction. At a particular point in space, the magnitude of the electric field is pointing in the positive z-direction. The permeability of free space is 1 . 25664 × 10 − 6 N / A 2 , the permittivity of free space is 8 . 85419 × 10 − 12 C 2 / N / m 2 and speed of light is 2 . 99792 × 10 8 m / s. y z x E wave propagation What are the directions of the instanta- neous magnetic field and the instantaneous Poynting vector respectively?...
View Full Document

This note was uploaded on 03/03/2011 for the course PHY 303L taught by Professor Turner during the Spring '08 term at University of Texas.

Page1 / 5

hw18 - homework 18 – LIN KEVIN – Due May 5 2008 4:00 am...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online