The γ - form of iron has fcc structure (edge length 386 pm) and β - form has bcc structure (edge length 290 pm). The ratio of density in γ - form and β - form is :

Question

The γ - form of iron has fcc structure (edge length 386 pm) and β - form has bcc structure (edge length 290 pm). The ratio of density in γ - form and β - form is :, 0.848, 1.02, 1.57, 0.6344

MARKS App · Accepted Answer

d γ d β = d fcc d bcc = 4 × A N a × 1 a fcc 3 2 × A N a × 1 a bcc 3 = 2 a bcc a fcc 3 = 2 × 2 9 0 3 8 6 3 = 0.848

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