A 23-M-Long Metal Bar Is Heated So That Its Temperature Increases

Multiple Choice

A 2.3-m-long metal bar is heated so that its temperature increases by 56ºC. The bar increases in length by 1.67 mm. The coefficient of linear expansion of the bar is

A) $15 \times 10 ^ { - 5 }$ 1/ºC.
B) $13 \times 10 ^ { - 6 }$ 1/ºC.
C) $11 \times 10 ^ { - 7 }$ 1/ºC.
D) $22 \times 10 ^ { - 7 }$ 1/ºC.