What are the 4R's?
4R’s stands for Reduce, Reuse, Recycle and Refuse.
The edge lengths of the unit cells in terms of the radius of sphere constituting fcc, bcc and simple cubic unit cells are respectively .......
(a)2√2r,4r√3,2r (b) 4r√3,2√2r,2r
(c)2r,2√2r,4r√3 (d) 2r,4r√3,2√2r
Being a responsible citizen, we have to develop habits that are environment-friendly. What is the 4R principle we all should follow?