Question

The thickness of human hair is approximately 5*10^-3 cm. How many strands of human hair together will be one cm thick?

Answer 1

Answer :

Let ,

Total number of strands of human hair together will be one cm thick = x
And
Thickness of a hair = 5$\times$10^-3 cm , So

x ( 5$\times$10^-3 ) = 1

x = $\frac{1}{5\times {10}^{-3}}=\frac{1}{{\displaystyle \frac{5}{{10}^3}}}=\frac{{10}^3}{{\displaystyle 5}}=\frac{1000}{5}=\mathbf{200}(\mathrm{We}\mathrm{know}{a}^{-m}=\frac{1}{a^m})$

Total number of strands of human hair together will be one cm thick = 200 ( Ans )