I’ve assisted in a research done on data science by one of my high school teachers. Now, I want to enlist this in activity section but my preferred major is Physics. Will this be good to mention an activity that isn’t directly related to my major? Of course data science is a part of physics, but I’m confused whether admission committee may find it relevant or not. Please enlighten me.

Someone please help!

Your activities do not need to match your projected major. It would be fine to include.