If the cubic expansivity of brass between 27°C and 100°C is 5.7 x 10^-5K−¹. What is its linear expansivity?

A. 2.85 x 10^-5K−¹
B. 1.90 x 10^-5K−¹
C. 1.86 x 10^-5K−¹
D. 1.70 x 10^-5K−¹
E. 1.63 x 10^-5K−¹

Correct Answer:

Option B – 1.90 x 10^-5K−¹

Explanation

α = Δ/3=(5.7×10^−5)/3

= 1.90 x 10^-5K−¹