ACTICE 6
Class 9
Science
10 Jan 20
The rate of growth of hair on the human head has been estimated as about 0.44
mm per day. Assuming that this rate is uniform, about what LENGTH of hair
About 300 m
(considering just 1 strand) would a normal male adult cut in 20 years?
About 30 m
About 3 m
About 30 cm
Answers
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The length of hair after 20 years will be approximately:
3. About 3 m.
- According to the question,
Rate of growth per day = 0.44 mm
Time period = 20 years
Number of days in a year = 365 days
- Therfore, the length of hair will be :
=0.44 x 20 x 365
=3212 mm
=3.2 m (approx 3 m)
- The length of hair after 20 years will be approximately 3 metres
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