Question

what happens when silver bromide is exposed to sunlight

Answer 1

this reaction is call photolytic decomposition in reaction AgBr will breakdown in Ag and Br
chemical equation is
2AgBr---sunlight--- 2Ag + Br2
Hope it helps you

Answer 2

It decomposes to silver and bromine
in presence of sunlight.

Sunlight act as catalyst for following
rxn
2 AgBr→2 Ag + Br2