Question

how can you difference between boys voice and girls voice in the physics sound chapter..??

Answer 1

after taking place of puberty,
as Boys voice box enlarges it sounds deeper and sometime voice sounds breaking
whereas on girls, it sounds very high pitched and little king of loud

Answer 2

Girls' vocal cords are usually shorter and thinner than most boys', which is why their voices sound higher. This difference in pitch is even more noticeable in grown-up men and women. ... Girls' bodies produce testosterone too, but not as much as boys' do.
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