Final answer:
The level at which a person speaks most frequently involves the pitch and volume of voice, commonly falling within a specific frequency and intensity range as depicted in scientific figures for normal conversational speech. Phone losses can affect one's ability to hear and understand conversations.
Step-by-step explanation:
The level at which a person speaks most frequently is often related to the concepts of pitch and volume as aspects of human speech. Pitch refers to the highness or lowness of a voice and is unique to each individual. Volume refers to the loudness of the speech.
Conversational speech typically falls within a certain frequency and intensity range as represented by the shaded region in Figure 17.35. The frequency spectrum of human hearing extends beyond the range commonly used for conversation, particularly above 8000 Hz, which is not typically necessary for understanding speech.
However, individuals with hearing loss, such as those with 40 or 60-phon losses, may experience difficulties in normal auditory perception of conversational speech, depending on the severity of the loss.