Question

what is the energy transformation that occurs in a cell phone in order to play music? solar energy is transformed into thermal energy. sound energy is transformed into chemical energy. electrial energy is transformed into sound energy.

Explanation:

A cell phone uses electrical energy stored in its battery. When playing music, this electrical energy is converted into sound energy to produce the audio. Solar energy is not directly involved in the basic function of playing music on a typical cell - phone (unless it's a solar - powered phone, but the question doesn't specify that). Sound energy being transformed into chemical energy is the reverse of what happens (chemical energy in the battery is converted to electrical and then to sound).

Answer:

Electrial energy is transformed into sound energy.