Vocal cord length is about 20 mm in men, 15 mm in women, and much shorter in young children. The direct implication is:
AChildren can hear more frequencies than adults
BMen can speak louder than women
CMen have wider audible ranges than women
DVoices typically rise in pitch from man → woman → child, because shorter cords vibrate at higher frequencies
Answer & Solution
Correct answer: D. Voices typically rise in pitch from man → woman → child, because shorter cords vibrate at higher frequencies
Shorter, tighter cords vibrate faster and produce higher-pitched sounds. So pitch generally increases in the order man → woman → child, as cord length decreases. (Loudness is unrelated to cord length and depends on how forcefully air is pushed through.)
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