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Wave property of electrons implies that they will show diffraction effects. Davisson and Germer demonstrated this by diffracting electrons from crystals. The law governing the diffraction from a crystal is obtained by requiring that electron waves reflected from the planes of atoms in a crystal interfere constructively (see in figure) <br> <img src=""/><br> Electrons accelerated by potential V are diffracted from a crystal. If d = 1Å and $i = 30^o$, V should be about $(h = 6.6 \times 10^{-34} Js$, $m_e = 9.1 \times 10^{-31} kg, e = 1.6 \times 10^{-19} C)$

( A ) 1000 V
( B ) 500 V
( C ) 50 V
( D ) 2000 V

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