Welcome to the forum.
I hope we may be able to help you, and you us, in the years to come.
As regards your current questions: one of the forum policies is that we do not help people with homework and assignments.
Your course providers want to know what you know, not what you have been able to find out from us.
So, we may not have been much help this time, but wish you luck in your assignment..
p.s. Radio: noun? verb? activity? equipment? process?