If the de Broglie wavelength of a proton...

If the de Broglie wavelength of a proton is 100 fm, (a) what is the speed of the proton and (b) through what electric potential would the proton have to be accelerated to acquire this speed?

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(a) `3.96xx10^(6)m//s,` (b) `81.8kV`

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