Question

what happens when agbr is exposed to sunlight

Answer 1

It decomposes to Ag and Br gas on exposure to sunlight
decomposition reaction

Answer 2

$\huge\textcolor{green}{\texttt{Answer :-}}$

When $AgBr$(silver bromide) is exposed to sunlight, it undergoes photo decomposition ( decomposition reaction under the presence of sunlight or light energy).

Hence, $AgBr$ splits or breaks down into $Ag\:and\:Br_2$

Reaction :

$AgBr(in\:the\:presence\:of\:sunlight) ----) \\ Ag + Br_2$