Question

What is the width of a human hair in meters?

a) 2 x 10^-5
b) 1.5 x 10^-4
c) 5 x 10^-4
d) 2.5 x 10^-6

Answer 1

The closest estimation of the width of a human hair in meters is option a) 2 x 10^-5 meters, which is equal to 20 micrometers (µm), even though the typical diameter is approximately 60 µm.

Step-by-step explanation:

The width of a human hair is typically in the range of micrometers. Given the options presented, the closest estimation of a human hair's width in meters would be option a) 2 x 10^-5. To provide context, a micrometer is equivalent to 10^-6 meters, so when considering this, the diameter can be calculated as 60 x 10^-6 meters or 60 micrometers (µm). Thus, none of the options perfectly match the typical width, but option a) would be the closest approximation if we assume that the diameter and width can be used interchangeably here.