After two half-lives, the amount of radioactive substance remaining will be
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Answer:
The structure in the first image file attached below shows the arrangement of atoms in hexagonal close packing
we need to show that the ratio between the height of the unit cell divided by its edge length is 1.633
In the structure, the two atoms are shown apart. But in fact the two atoms are touching. Therefore, the edge length is the sum of the radius of two atoms. If we assume r as radius then the expression for edge length will be as follows.
a = 2r ..............(1)
other attached files show additional solutions in steps
