In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct answer out of the following choices.

(a) Assertion and Reason both are correct statements and Reason is correct explanation for Assertion.

(b) Assertion and Reason both are correct satements but Reason is not correct explanation for Assertion.

(c) Assertion is correct statement but Reason is wrong statement

(d) Assertion is wrong statement but Reason is correct statement.

Assertion (A) The total number of atoms present in a simple cubic unit cell is one.

Reason (R) Simple cubic unit cell has atoms at its corners, each of which is shared between eight adjacent cells.

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Solution

(a) In simple cubic unit cell each atom is present at corners having contribution 1/8.

Hence, total number of atoms present per unit cell in scc is $\frac{1}{8} \times 8 = 1$

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(a) In simple cubic unit cell each atom is present at corners having contribution 1/8. Hence, total number of atoms present per unit cell in scc is 18×8=1

(a) In simple cubic unit cell each atom is present at corners having contribution 1/8.

Hence, total number of atoms present per unit cell in scc is $\frac{1}{8} \times 8 = 1$