Properties Of Solids And Liquids Question 405

Question: A bar of iron is 10 cm at 20C . At 19C it will be (α of iron=11×106/C )

Options:

A) 11×106 cm longer

B) 11×106 cm shorter

C) 11×105 cm shorter

D) 11×105 cm longer

Show Answer

Answer:

Correct Answer: C

Solution:

[c] L=L0(1+αΔθ)L1L2=1+α(Δθ)11+α(Δθ)2

10L2=1+11×106×201+11×106×19L2=9.99989

Length is shorten by 109.99989=0.00011=11×105cm.



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