Every time I use Google Search, the browser or the music player of my Samsing Galaxy S II (Android 2.3), even if I push the back button until it brings me back to the home screen, the apps keep running in background (seen in the "Active Applications" widget).
Do they consume my batery? Do they enter in some kind of supended mode, so they don't consume the CPU? If they do consume, is there any configuration to make them really close when I push the back button?