Statement I: The expanded length l of a rod of original length `l_0` is not correctly given by
Channel: Doubtnut
Date: 2020-07-26

Statement I: The expanded length l of a rod of original length `l_0` is not correctly given by (assuming `alpha` to be constant with T) `l=l_0(1+alphaDeltaT)` if `alphaDeltaT` is large.  Statement II: It is given by `l=l_0e^(alphaDeltaT)`, which cannot be treated as being approximately equal to `l=l_0(1+alphaDeltaT)` for large value a `DeltaT`.