What? Yes you can. I know my laptop is running a web browser because I can see it and interact with it. That's a physical measurement.
Won't be surprised if he's one of those that think "radiation" is some kind of harmful beams instead of also what the computer screen emits and we detect it to interact with it.
Won't be surprised if he's one of those that think "radiation" is some kind of harmful beams instead of also what the computer screen emits and we detect it to interact with it.