JAMB - Physics (1993 - No. 11)
A metal rod 800mm long is heated from 10oC to 95oC. If it expands by 1.36mm, the linear expansivity of the metal is
2.0 x 102K-1
2.0 x 102K-1
5.0 x 10-3K-1
2.0 x 10-5K-1
解释
a = \(\frac{1.36}{800 \times (95 - 10)}\)
= 2.0 x 10-5K-1
= 2.0 x 10-5K-1