Question

29. A metal rod of length L at temperature T, when heated to temperature T', expands to new length
L' = L [1 + a (T' - T)] where a is a constant for that material and called as co-efficient of linear
expansion. Correct SI unit of a is
(B) mK^-1
(C) K^-1
(D) a is a pure number
(A) mK​

Answer 1

A is pure number my answer

Answer 2

Answer:

answer is (c) K^-1

Explanation:

L'(m) = L(m) [ 1 + a(?)( T'(K) -T(K) ) ]

a si unit should be K^-1 because to cancel out the K in the Temperature equation.