For the first question, you'd have to shorten the medium it is projected by.
Like on a guitar, when you press the string on the fret, you're shortening the length of the medium, therefore allowing a shorter frequency/higher pitch.
The second one, more applied energy into the sound wave would allow it to reverberate louder.
And lastly, heat is a form of energy transferred in various ways throughout our daily lives including radiation, convection, and conduction.
Hope this helped!
