What type of male voice was introduced into the Sistine Chapel in 1562 as a

What transduces sounds into electrical energy?

a. an audio mixer b. a microphone c. a pickup pattern d. a speaker

A "clapperboard" (also called a "slate") is

A. a sign held in front of the lens to record information about a particular take. B. a device used to signal extras in large crowd scenes. C. a tool for creating sound effects in postproduction. D. a large chart listing the personnel due to work on a film on any given day.