Sample Test AAMC: Chem/Phys. Passage 10 Q52

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snovakov

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What is the frequency of the emitted gamma photons? (Note: Use Planck’s constant h = 6.6 x 10–34 Js and the elementary charge e = 1.6 x 10–19 C.)

Correct answer 3.38e19Hz
I know the formula E=hf, but when I apply it I get a different answer am I missing a conversion for units?

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[140kEV(1000ev/1kEV)(1.6*10^-19J/eV)]/(planks constant)

You have to convert to Joules first to get the energy and then plug into E=hf
 
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