Question

Calculate the medullary index of a hair whose diameter is 110 microns and whose medulla measures 58 microns. Is this human or nonhuman animal hair?

Answer 1

58/110 = . 53 ( >. 33 so it is an animal)

Answer 2

Answer:

The hair is a nonhuman animal hair.

Explanation:

To decide if this hair is a human hair or a nonhuman animal hair, we need to calculate the medullary index.

The medullary index has the following formula :

$MedullaryIndex=\frac{Medulla'sWidth}{EntireHair'sWidth}$ (I)

If we replace the data from the question in the equation (I) :

$MedullaryIndex=\frac{58microns}{110microns}=0.527$

The medullary index is 0.527

Now, the medullary index for humans is 0.33 or less while the medullary index for animals is 0.50 or greater.

⇒ $0.527>0.50$ ⇒

We answer that the hair is a nonhuman animal hair.