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What are the changes seen in girls at th...

What are the changes seen in girls at the time of puberty?

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The changes seen in girls at the time of puberty are :
• Increase in breast size and darkening of skin of the nipples present at the tips of the breasts.
• Appearance of hair in the genital area.
• Appearence of hair in other areas of skin like underarms, face, hands and legs.
• Increases in the size of uterus and ovary.
• Begining of menstrual cycle.
• More secreation of oil from the skin, which results in the appearance of pimples.
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  • In a biprism, 21 fringes are distinctly seen on screen at a distance of 1 m, when the sources are 0.5 mm apart, what is the coherent length and coherent time of the set up .( lambda = 6000 Å ):

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