Question

What is the order for photo chemical reaction ?(very short answer)​

Answer 1

Photochemical reactions do not have a reaction order. If the concentration of the substrate should decrease exponentially with time, that reflects only on the choice of experimental conditions and not on any intrinsic characteristic of the reaction.

$\huge{\mathcal{\purple{A}\green{N}\pink{S}\blue{W}\purple{E}\green{R}\pink{!}}}$

Answer 2

Photochemical reactions do not have a reaction order.

Your very short answer here