sound energy to thermal energy thermal energy to chemical energy mechanical energy to sound energy mechanical energy to chemical energy
I gave my students this multiple choice question: The sound made by crickets occurs when the male crickets rubs its two hind legs together. Which type of energy transformation results in the sound made by crickets?

Only one answer is correct among these 4 choices:
- sound energy to thermal energy
- thermal energy to chemical energy
- mechanical energy to sound energy
- mechanical energy to chemical energy

Could you tell me which one is correct?

mechanical energy to sound energy