Question

The length of a metal scale at 0 °C is L0. After heating it to 25 °C the final length reads 50 cm. If α = 18 × 10‐⁶ °C‐¹, find L0
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Answer 1

Answer:

Correct option is C

4.999m

ls′=lb′=5 m

Tf=400c

Actual length of brass tube, lb=?

Ti=0

For Length of scale at 00=ls,    ls′=ls(1+αsΔT)

                            5=ls(1+40αs)

                            ls=1+40αs5

Actual length of tube at 400

lb′=ls′+Δls

       =ls′+ls′−ls

 

     =2ls′−ls

l

Explanation:

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