Which of the following increases led to Darcy being startled when Darcy's brothers started yelling?

Question

Quizplus · Accepted Answer

Amplitude refers to the intensity or volume of the sound. If the brothers started yelling loudly, the increase in amplitude could startle Darcy. Frequency refers to the pitch of the sound, purity refers to the lack of overtones, and timbre refers to the tone quality, none of which would necessarily cause Darcy to be startled.

Which of the Following Increases Led to Darcy Being Startled