Respuesta :
He should decrease the frequency because frequency is the pitch of a sound so the lower the frequency the lower the pitch
Answer: Option D: He should decrease the frequency.
Pitch is a perceptual property of sound. It can be perceived in the sense of high or low musical melodies. The pitch and frequency are related. when frequency increases, pitch increases. And when frequency decrease, pitch decreases.
Hence, the correct option is D: he should decrease the frequency.