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PLEEASE HELP! I AM LOST Thank you.

by madd_bm
Tags: lost, pleease
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madd_bm
#1
Nov17-08, 10:20 PM
P: 6
I have two questions:

1. Electromagnetic waves also can form standing waves. In a standing wave pattern formed from microwaves, the distance between a node and an adjacent antinode is 0.44 cm. What is the microwave frequency.
I keep getting the wrong answer here. I am not sure what I am doing wrong. It seems like I am missing some information, but this is the entire question.....I think I am confused and I really don't know where to begin. If you could explain to me where to start I will probably be able to figure this one out. The class is an online class and I don't get much help from the instructor....thanks.


2.
In experiment 1, unpolarized light falls on the polarizer in the figure below. (see attachment untitled1) The angle of the analyzer is θ = 62.5. In experiment 2, the unpolarized light is replaced by light of the same intensity, but the light is polarized along the direction of the polarizer's transmission axis. By how many additional degrees must the analyzer be rotated so that the light falling on the photocell will have the same intensity as it did in experiment 1? Explain whether θ is increased or deceased by this additional rotation. (Use a positive number to indicate an increase in the angle. Use a negative number to indicate a decrease in the angle.)

I started with this: 1/2cos^2theta = .10661
but I'm not sure what to do from there.

The attempt at a solution
cos^-1(.10661) = 83.8deg., then 83.3-62.5 = 21.3....but that is wrong.

Thank you.
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alphysicist
#2
Nov17-08, 10:46 PM
HW Helper
P: 2,249
Hi madd_bm,

Quote Quote by madd_bm View Post
I have two questions:

1. Electromagnetic waves also can form standing waves. In a standing wave pattern formed from microwaves, the distance between a node and an adjacent antinode is 0.44 cm. What is the microwave frequency.
I keep getting the wrong answer here. I am not sure what I am doing wrong. It seems like I am missing some information, but this is the entire question.....I think I am confused and I really don't know where to begin. If you could explain to me where to start I will probably be able to figure this one out. The class is an online class and I don't get much help from the instructor....thanks.
Can you show what you did that gave the wrong answer?


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