Answer:
it expands by 11 cm.
Explanation:
First we need the coefficient of linear thermal expansion of steel
a = 12e-6/K
Now we use the equation for linear thermal expansion
L1 = L0 * (1 + a * (t1 - t0))
Where
L0: length before expansion
L1: expanded length
t0: temperature before expansion
t1: temperature expanded
L1 = 403 * (1 + 12e-6 * (24 - 1.22)) = 403.11 m
It expanded 11 cm.