Question

why girls have a shrilled voice and adult boys has a bass voice.

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Answer 1

Males and females have different vocal fold sizes. Adult male voices are usually lower pitched due to longer and thicker folds. The male vocal folds are between 1.75 cm and 2.5 cm (approx 0.75" to 1.0") in length, while female vocal folds are between 1.25 cm and 1.75 cm (approx 0.5" to 0.75") in length. The vocal cords of children are much shorter than those of adult males and females.

Answer 2

Due to pitch.women have high pitch low frequency and men low pitch high frequency