Name: Use of Exponents to Express Small Numbers in Standard Form
Uploaded: 2019-07-19
Duration: 8 min 15 s
Description: In this video, we will learn how to express a number in its standard exponential form. Very large as well as very small numbers can be expressed in standard...

Question

Anaemia causes due to deficiency of Red Blood cells. The size of a red blood cell is

0.000000007 mm

. Express it in standard form. Rahul is suffering from anaemia, his doctor advised him to take healthy food regularly and avoid junk food. Why should we eat healthy food? What values are being promoted?

Accepted Answer

Given the size of a red blood cell is $0.000000007 mm$

We need to express size of the red blood cell in standard form.

A number is said to be in the standard form if it is expressed as $k \times 10^{n}$ , where $k$ is a decimal number such that $1 \leq k < 10$ and $n$ is an integer.

That is, $0.000000007 mm = 7 \times 10^{- 9} mm$ (Note that decimal is moved $9$ places to right)

Hence, standard form of given decimal is $7 \times 10^{- 9} mm$ .

Deficiency of red blood cells causes anaemia. In order to keep healthy, healthy food should be taken and avoid junk food.

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