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**Light question.....difficulty finding answer....**

My prof. just gave us about 6 questions on the last chapter of the summer semester, which is on light...he said we could try the question but if we couldnt get it right it was okay....I tried it anyways and I cannot get it....

At what range must electrons in a wire vibrate to emmit microwaves with a wavelength of 1.00 mm? He told us to note next to the question the word charge.

So here's what I did....

I used the equation : speed of light in a vacuum = (wavelength)(frequency)

since I was trying to find f I used the equation f= c/Lambda

f= 3.00 x 1068 m/s

______________

1 x 10 ^ -3 m

= 3 X10 ^11 hz

Then I used the equation e=hf to find the enerty of photon

(6.63 X10 ^-3 Js)(3 X 10 ^11 xs)

= 1.98 x10^-22 J

I'm not sure what the question is asking for really.....