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Answer:
(b) 6.9 cm
Explanation:
Thermal expansion is given as
L' = L + L@∆T
where , L' = expanded length
L = Original length
@ = coefficient of expansion
∆T = change in temprature
on applying formula
L' = 20 + 20 × 11.5 × 10^(-4) × 30 m
L' = 20 + 0.0687
L' = 20.0687
For expansion
= L' - L
= 20 - 20.0687 m
= 0.0687m => 6.9 cm or (b) 6.9 cm
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