JAMB - Physics (1990 - No. 12)
A bar of initial length /0 is heated through a temperature change \(\Delta\)t to a new length I. The linear expansivity, a, of the bar is
\(\frac{/ - /_o}{/ \Delta t}\)
\(\frac{/ - /_o}{/_o \Delta t}\)
/o(1 + \(\Delta\) t)
\(\frac{/ - /_o}{/(1 + \Delta t)}\)
Giải thích
\(\frac{L - L_o}{L_o \Delta t}\)