Answer: \(7.8 \times 10^{-5} \text{ meters}\)
Step-by-step explanation:
The length of a vicuna hair = 0.000006 = \(0.6 \times 10^{-5}\)
And, the length of the a human hair = \(8.4\times 10^{-5}\)
Thus, the difference between the human hair and vicuna hair
\(= 8.4\times 10^{-5}-0.6\times 10^{-5}\)
\(=10^{-5}(8.4-0.6)\)
\(=10^{-5}(7.8)\)
\(=7.8\times 10^{-5}\)
⇒ Option D is correct.
