Choose the words that correctly complete the sentences. There are many stories that exist of opera singers breaking wine glasses with their voices.

The vocalist must match the (pitch / volume / intensity / density) of their voice to the natural (mass / thickness / loudness / frequency) of the glass. The louder the singer can go, the more (volume / intensity / pitch / density) the vibrations have, and the better the chance of shattering the glass.
Your

the most common energy conversion is from kinetic energy to potential energy, and then from potential energy to kinetic energy.

later on comes the heat energy, mechanical energy, and other energy conversions.

this energy conversion is so common that we can find it in our day to day lives as well.

- one of the most common energy conversions involves the changing of potential energy to kinetic energy or kinetic energy to potential energy

a and c are the answeres