Question

The volume of a metal block changes by 0.86% when heated through 200 °C then its coefficient of cubical expansion is ______.

Options

• 43 x 10^-6/ °C

• 86 x 10^-6/ °C

• 43 x 10^-5/ °C

• 8.6 x 10^-5/ °C

Answer 1

The volume of a metal block changes by 0.86% when heated through 200 °C then its coefficient of cubical expansion is 43 x 10^-6/°C.

Explanation:

`gamma = "change in volume"/("original volume" xx "change in temperature")`

` = 0.86/(100 xx 200)`

`gamma` = 43 `xx` 10^-6/ °C