Question

when a wave enters in a medium , what does not change

Answer 1

$\huge\red{As-Salamu-Alykum}$


___________


$\huge\purple{Frequency Does not change}$



___________

$\huge\green{INSHALLAH it will help U}$

Answer 2

The frequency does not change, as it depends on source, not medium, while a wave enters in a medium.