Final answer:
Pitch refers to the highness or lowness of a sound and can be modified by tightening or loosening the vocal cords. To increase the pitch of their voice, a person can tighten their vocal cords and speak at the same volume. Caution should be exercised when directly modifying pitch to avoid strain or damage.
Step-by-step explanation:
Pitch refers to the highness or lowness of a sound and is determined by the frequency of the sound waves. It can be modified by changing the tension or length of a vibrating object. In the case of a human voice, the pitch can be directly modified by tightening or loosening the vocal cords. When the vocal cords are tightened, the pitch increases and when they are loosened, the pitch decreases.
If a person wants to increase the pitch of their voice, they can do so by tightening their vocal cords and speaking at the same volume. This means that the frequency of the sound waves produced by their vocal cords will be higher, resulting in a higher pitch. However, it is important to exercise caution when manipulating the pitch of the voice to avoid strain or damage to the vocal cords.