Question: By what potential difference must (a) A proton (m = 1.67 10-27 kg), (b) An electron (m = 9.11 10-31 kg), be accelerated

By what potential difference must
(a) A proton (m = 1.67 × 10-27 kg),
(b) An electron (m = 9.11 × 10-31 kg), be accelerated from rest to have a wavelength λ = 4.0 × 10-12 m?

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