Question
Question: A crystal has a coefficient of expansion 13 × 10<sup>–7</sup> in one direction and 231 × 10<sup>–7</...
A crystal has a coefficient of expansion 13 × 10–7 in one direction and 231 × 10–7 in every other direction at right angles to it. Then the cubical coefficient of expansion is –
A
462 × 10–7
B
244 × 10–7
C
475 × 10–7
D
257 × 10–7
Answer
475 × 10–7
Explanation
Solution
g = a1 + 2a2 = (13 + 2 × 231) × 10–7 = 475 × 10–7