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During solidification of a pure metal, the radius of critical nucleus at an undercooling of 10 K is ______ × 10–9 m (answer rounded off to 1 decimal place).
Given: solid/liquid interface energy = 0.177 Jm-2, melting point of the metal = 1356 K and latent heat of fusion = 1.88 × 109 Jm-3
