An electron is accelerated through a potential difference of 10,000 V. Its de Broglie wavelength is, (nearly) : (me = 9 × 10–31 kg)
(1) 12.2 × 10–13 m
(2) 12.2 × 10–12 m
(3) 12.2 × 10–14 m
(4) 12.2 nm
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