The diameter of human hair is
75m
75000
7.5×10−57.5 \times 10^{-5}7.5×10−5
7.5×10−97.5 \times 10^{-9}7.5×10−9
(C) 7.5×10−57.5 \times 10^{-5}7.5×10−5
Explanation:
