Q 183. Rock salt forms a cubic lattice with sides of each cube having a length of 5.63 A ° . The least potential difference across which the electrons should be accelerated so that they are reflected strongly by dashed planes indicated by dashed lines is

(1) 2.44 V           (2) 5.44 V           (3) 7.44 V         (4) 9.18 V

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