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**[SOLVED] (101)Gamma frequency?**

## Homework Statement

A gamma particle of energy 4.5 MeV is detected as a product of some nuclear reaction (4.5 MeV is 0.72 pJ). What is the frequency of this gamma radiation?

## Homework Equations

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## The Attempt at a Solution

I tried using d=vt because it was the closest formula I could find in my notes that had anything to do with frequency. I assumed v=3x10^8. Of course, the answer was not correct. Could someone point me in the right direction here? I figured out every other problem but this one, and I only have 1 attempt left