A bar of initial length /0 is heated through a temperature change \(\Delta\)t to a…

Physics JAMB 1990

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

  • \(\frac{/ - /_o}{/ \Delta t}\)
  • \(\frac{/ - /_o}{/_o \Delta t}\) checkmark
  • /o(1 + \(\Delta\) t)
  • \(\frac{/ - /_o}{/(1 + \Delta t)}\)

The correct answer is: B

Explanation

\(\frac{L - L_o}{L_o \Delta t}\)
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