Struggling with Jackson 3rd Ed Chapter 11 Question 12?

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Please help for jackson (3rd. edition) chapter 11 question 12.
 
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https://www.physicsforums.com/showthread.php?t=94380

Show us the work you've done so far, what is your difficulty, etc. Also, maybe you could write out the question so somebody who doesn't have the textbook but may know how to solve your problem could help you (if such a person exist).

You just won't have any valuable answer with a thread done like that.
 

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The value of H equals ## 10^{3}## in natural units, According to : https://en.wikipedia.org/wiki/Natural_units, ## t \sim 10^{-21} sec = 10^{21} Hz ##, and since ## \text{GeV} \sim 10^{24} \text{Hz } ##, ## GeV \sim 10^{24} \times 10^{-21} = 10^3 ## in natural units. So is this conversion correct? Also in the above formula, can I convert H to that natural units , since it’s a constant, while keeping k in Hz ?
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