Noise / sound exist independently of observation, at least so long as you subscribe to the idea that there exists an objective reality outside of your own mind. They are pressure waves transmitted through some medium.
The tree makes a sound, which no one hears.
Noise / sound exist independently of observation, at least so long as you subscribe to the idea that there exists an objective reality outside of your own mind. They are pressure waves transmitted through some medium.
The tree makes a sound, which no one hears.