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निम्न जलको में प्रति एकक कोष्ठिका (यूनिट सैल) में कितने जालक बिंदु होते है ?
(i) फलक केंद्रित घनीय (fcc)
(ii) फलक केंद्रित चतुष्फलकीय (fct)
(iii) अन्त: केंद्रित (bc)

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(i) `because` फल्किय केंद्रित घनीय जालक में जालक बिंदु = 8 (कोनो पर) + 6 फलक के केंद्र में = 14
`therefore` प्रति इकाई सेल में `= 8 xx (1)/(8) + 6 xx (1)/(2) = 4`
(ii) फलक केंद्रित चतुष्फलकीय जालक में क्रिस्टल अवस्था नहीं पायी जाती है ।
(iii) अन्त: केंद्रित घनीय जालक में जालक बिंदु = 8 (कोनो पर) + 1 (केंद्र में) = 9
प्रति इकाई सेल `= 8 xx (1)/(8) + 1 = 2`

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