Question

What is the approximate diameter of human hair?
A. 500nm
B. 5000nm
C. 50nm
D. 50000nm

Answer 1

Hint: This is a factual question and it is very interesting to know the diameter of your hair strand. The diameter of the hair strand is measured with the help of laser beam diffraction. Diameters of hair can be of various sizes therefore an approximate value will be considered.

Complete Step-by-Step solution:
The diameter of a human hair does not have an absolute value as different people have different hair structures. There are various factors which determine the size of human hair. Genetics and Hereditary is one such factor that changes the size and width of hair. Hair colors are another contributing factor. For instance, Dark hair is thicker than light hair. The climate can also influence the diameter of a hair strand. Warmer temperatures tend to increase the diameter of hair. Age is another factor. As an individual grows up, their hair gets thicker and more grounded.
According to studies and experiments, laser beam diffraction is used to determine the radius of hair. It is found that the average diameter of human hair can vary anywhere from 17 micrometers to 181 micrometers. So, taking an average value of its diameter as 50 micrometers, which can further be written as 50000 nanometers.
Hence option D is correct.

Note- Metric conversions are widely used in physics, chemistry as well as maths. Therefore it is imperative to know how to convert certain values in one unit to another. We know from the conversion of units that $1\mu = 1000nm$.
Hence, $50\mu = 50000nm$.