What are some examples of noise energy?

Answer 1

"Noise" is just a broad category of sound that doesn't happen to be organized. Sound that is organized might be called music or speech. Sometimes a hum or a buzz might be classified as noise by one person but not another.

With that said - noise, like any sound, is just a series of pressure waves. The energy of sound is pretty evident when the pressure waves are especially intense - such as in an explosion. There more subtle examples when sound causes a surface to vibrate and causes it to gradually warm up.