Question

A silver bar 0.125 meter long is subjected to a temperature change from 200 C to 100 C . What will be the length of the bar after the temperature change?

A) 0.00023635 meter
B) 0.124764 meter
C) 0.00002363 meter
D) 0.0000189 meter

Answer 1

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Answer 2

\Delta L= \alpha L_0 (T_f-T_i)

= (18 x 10^-6 /°C)(0.125 m)(100° C - 200 °C)

= -0.00225 m

New length = L + ΔL
= 1.25 m + (-0.00225 m)
= 1.248
So your answer is B.