Calculating Microwave Oven Energy Transfer: What Information Do I Need?

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In summary, to find the energy transferred per unit time from a microwave oven, you will need to use the equations c = f*lambda and I = (c*B^2)/(permeability of free space). You can find I from the given peak magnetic field, but you will also need to consider the average of I and its relation to power. Additionally, remember that c refers to the speed of light, which is 2.99 x 10^8 m/s.
  • #1
ninjadrummer8
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Homework Statement


I need to find the energy transferred per unit time from a microwave oven, and the only information I have is:

Wavelength = .122m
Peak Magnetic Field of microwaves = 1.3*10^-5 T


Homework Equations


c=f*lambda
I = (c*B^2)/(permeability of free space) = EB / (permeability of free space)


The Attempt at a Solution


My problem is I need either "c" or "f" in c=f(lambda) OR the electric field... I think? I'm not quite sure what to do.
 
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  • #2
ninjadrummer8 said:
I = (c*B^2)/(permeability of free space)

You can find I from the given B. Two more things to think about:

1. Using the peak B given will result in the peak of I. What will be the average of I?

2. How does I relate to power?
 
  • #3
Ok, but I run into the same problems again. I have neither c nor E so I am stuck with 3 unknowns.
 
  • #4
But you do have c. Think about it ... what is c?
 
  • #5
OH! I'm an idiot. c is just the speed of light isn't it? so 2.99 x 10^8 m/s
 
  • #6
ninjadrummer8 said:
c is just the speed of light isn't it? so 2.99 x 10^8 m/s

Yes.
 

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