Calculate Wavelength of 3.85 MeV Gamma Radiation from Technetium-99

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missy~needs~help
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Okay so I have this question...

A photon of gamma radiation emitted by the radioactive decay of technetium-99 has an energy of 3.85 MeV. This radiation has a wavelength of

a) 5.17x10^-26m
b) 3.23x10^-13m
c) 3.10x10^12m
d) 9.29x10^20m

Can anyone explain it...no idea how to even start it!:confused:
 
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Turn to the page on your text that first talks about energy and wavelength relationships for EM waves. Tell us what you find and how you plan to proceed.

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I figure...that it has something to do with
E= hc/T
 
That's a start.

What do the various symbols in that equation represent?

And secondly what have you learned about units when it comes to solving equations?