Describe how you could made a sound wave have a higher pitch.

describe how you could make a sound wave have a higher volume.

what is heat?

the quality of being hot; high temperature.

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!

Ithink d is the right answer. hope this !