Jee AdvancedSolid StateIIT-JEE 2010 Paper 2 OfflineMCQ+3 / -12010The packing efficiency of the twodimensional square unit cell shown below isA$39.27 \%$B$68.02 \%$C$74.05 \%$D$78.54 \%$Check AnswerClear SelectionReveal AnswerShow Explanation