About the essay topic, you are free to talk about ANY TOPIC BUT ONLY RELATED TO RADIO STUDIES. In the essay you can talk about your personal experience as well. So for example sound, radio and sound have a big connections so you can talk about sounds as well and make it related to radio studies. Just simply find your own way to narrow the topic down but at some point you will need to do some research for theory or theorist about your own topic as well, so you can have something to relate on your personal experience or even making an argument or agreement / disagreement about the theory / theorist. PLEASE ALSO BE CREATIVE, YOU CAN USE PICTURES, VIDEO / VIDEO LINKS OR ALSO MUSIC if you have one that you wanted to include that will be related to the essay topic but again it must be radio studies.