Through what potential difference should an electron be accelerated so that its de-broglie wavelength becomes 0 4 A - Physics - Dual Nature Of Radiation And Matter

Question

Through what potential difference should an electron be accelerated
so that its de-broglie wavelength becomes 0 4 A

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Through what potential difference should an electron be accelerated so that its de-broglie wavelength becomes 0.4 A.