Are the sounds made form gun apps copyrighted?

I would like to use the sound made from the shotgun gun app (the app where you can reload and fire on your iphone) for this school project, but teacher is making us check whether or not it is copyrighted. I know that certain sounds can be copyrighted like the sound that is made when you turn on your computer, but I am wondering if the sound made from the gun app is copyrighted... Thanks for answering!