How are frequency and intensity related to speech sounds?

The relationship between frequency and intensity in speech sounds is foundational to understanding how we perceive various qualities of sound. Frequency refers to the number of vibrations per second of a sound wave, and it is measured in Hertz (Hz). In terms of speech sounds, higher frequencies typically correspond to higher pitch. This means that when a speech sound has a higher frequency, our auditory system perceives it as sounding "higher" or more acute.

On the other hand, intensity relates to the amplitude of the sound wave, which we perceive as loudness. Greater intensity means a more significant amplitude, leading to a louder sound. In speech, when intensity increases, we hear the sound as being louder.

Thus, the correct answer accurately reflects that higher frequencies relate to higher pitch, and greater intensity correlates with increased loudness. This understanding is critical for fields such as speech science, as it helps in assessing voice quality and speech perception.