I am having trouble deciding when to use which equation.(adsbygoogle = window.adsbygoogle || []).push({});

If you're given the wavelength of a proton, let's say 100 fm, and have to find the kinetic energy of it, how would you do this?

Here are my ideas:

Idea 1: Use lambda = h/p, where p = sqrt(2Em).

Idea 2: Use E=(pc)^2+(mc^2)^2 = (mc^2)^2+(h/lambda * c)^2

Then I'll use:

K = E- E_o

==> (answer from idea 1 or 2) - mc^2

Which should I use? I personally think idea 2 is correct because it accounts for the relativisitic effects.

thank you!

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# Equation used to find kinetic energy of proton

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