SP212‐Spring‐2016 CH‐33‐A Assignment First do the following Wiley‐Plus assignment: Assignment #33a After completing the Wiley‐Plus, in your homework notebook, complete the following problems: CH33 Questions # 1, 4, and 6. CH33 Problems # 1, 3, 13, and 29. To check your work, the answers to the odd problems are in the back of the book. The answers to the even problems are: none assigned this assignment. Homework Then complete the attached worksheets: (Note: the above problems were designed to ensure you have the skills to solve the worksheet problems. It is imperative to your learning of the problem solving technique to do the above problems BEFORE attempting the worksheet problems. You are graded on both! Homework notebooks are graded.) CH‐33‐A‐1: For each of the equations below, 1) State what each term is in your own words … 2) What the units of each term are… 3) What is the general use of that equation in your own words? A. E  EM sin(kx  t ) B.
c
E
B

 
C. S  1 ( E  B)
0
D. I  1 Erms
c0
E. I  Ps 2 , include how this equation would change if the problem stated that the wave 4 r
spread hemispherically. F.
For this one include the major difference between when these two equations are used: pr 
I
C
pr 
2I
C
G. Explain how you can find force from the equation in F CH‐33‐A‐2: For an electromagnetic wave in a vacuum, the electric field is given by
E y  30.0sin(5.33106 x 1.60 1015 t ) where 30.0 has units of V/m, x has units of m
and t has units of s. What are the:
a) Wavelength ?
Show all work b) Average intensity of the wave? Show all work and
c) Speed of the wave? Show all work CH‐33‐A‐3: An upwardly directed laser beam focused to a small spot of area =2.00 × 10-3 m2
supports a small bead of glass in a vacuum chamber. If all of the light is absorbed by
the bead and the bead’s mass is 2.2×10-10 kg, what is the intensity of the laser
beam? Show all work CH‐33‐A‐4: The next two parts of this problem deal with an electromagnetic wave in a material where the electric
field has a y-component only and, in SI units, is given by
7
15
Ey = 50 sin (1.2x10 x - 1.8x10 t)
-9
a. The speed and wavelength (1nm=10 m) of the wave are closest to
8
A. 1.8x10 m/s and 524 nm.
8
B. 1.5x10 m/s and 524 nm.
8
C. 1.2x10 m/s and 650 nm.
8
D. 1.8x10 m/s and 483 nm.
8
E. 1.5x10 m/s and 483 nm.
Show all work b. The average value of the Poynting vector (intensity of the wave) is closest to
2
A. 2.5 W/m .
2
B. 3.3 W/m .
2
C. 4.3 W/m .
2
D. 5.1 W/m .
2
E. 6.7 W/m . Show all work