Magnitude of joule’* mechanical equivalent of heat in SI is :
(A) 4.2 x 107.
(B) 4.2 x 103.
(C) 4.2
(D) 1.
Answer is (D) 1
In SI, both heat and energy are measured in joules and so the joule’* mechanical equivalent of heat, which is a conversion factor is 1.
