Which of the following is a point imperfection 1. Vacancy 2. Interstitially 3. Frenkel imperfection 4. Schottky imperfection

Which of the following is a point imperfection 1. Vacancy 2. Interstit

1.	Which of the following is a point imperfection 1. Vacancy 2. Interstitially 3. Frenkel imperfection 4. Schottky imperfection
A.	1 and 2 only
B.	2 and 3 only
C.	2, 3 and 4 only
D.	1, 2, 3 and 4
Answer» E.

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Which of the following is a point imperfection 1. Vacancy 2. Interstitially 3. Frenkel imperfection 4. Schottky imperfection

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