Question

a _____________ is used to turn sound waves into an electrical signal for recording or amplification. a none of these b microphone c sound board d head set

Explanation:

A microphone is a transducer that converts sound waves (mechanical energy) into an electrical signal (electrical energy). A sound - board is mainly for mixing and processing audio signals. A headset is for listening to sound (output) rather than inputting and converting sound waves.

Answer:

B. microphone