Here we need to compare the orders of magnitude of two measures.
We will see that the bacteria is<em> 300 times larger than the virus.</em>
We know that:
The diameter of the virus-cell is:
![D_v = 3 \cdot 10^{-9} m](https://tex.z-dn.net/?f=D_v%20%3D%203%20%5Ccdot%2010%5E%7B-9%7D%20m)
The diameter of the bacteria cell is:
![D_b = 9 \cdot 10^{-7} m](https://tex.z-dn.net/?f=D_b%20%3D%209%20%5Ccdot%2010%5E%7B-7%7D%20m)
So, to compare them, first notice that both are in the same units, meters, so we only need to <u>compare the numbers</u>.
Is common sense to identify the one with the largest exponent as the largest number, and the largest exponent is -7, thus <u>the bacteria should be the larger one.</u>
But let's prove this with math, remember the property:
![\frac{a^n}{a^m} = a^{n - m}](https://tex.z-dn.net/?f=%5Cfrac%7Ba%5En%7D%7Ba%5Em%7D%20%3D%20a%5E%7Bn%20-%20m%7D)
Let's take the quotient between the diameters and see what we get, I will use the <u>diameter of the bacteria in the numerator</u>, thus <u>if the quotient is larger than 1, it would mean that the bacteria is greater and by how much.</u>
![quotient = \frac{ 9 \cdot 10^{-7} m}{ 3 \cdot 10^{-9} m} = \frac{9}{3} \cdot 10^{-7 + 9}\\\\= 3*10^2](https://tex.z-dn.net/?f=quotient%20%3D%20%5Cfrac%7B%209%20%5Ccdot%2010%5E%7B-7%7D%20m%7D%7B%203%20%5Ccdot%2010%5E%7B-9%7D%20m%7D%20%20%3D%20%5Cfrac%7B9%7D%7B3%7D%20%5Ccdot%2010%5E%7B-7%20%2B%209%7D%5C%5C%5C%5C%3D%203%2A10%5E2)
So we can say that the bacteria is 3*10^2 = 3*100 = 300 times larger than the virus.
If you want to learn more, you can read:
brainly.com/question/4953281