Question

the polio virus is 25 nanometers in diameter. How many would fit across the head of a pin 2 millimeters in diameter

Answer 1

2mm=2,000,000 nm
2,000,000/25=80,000
The answer is 80,000 polio viruses

Answer 2

Answer:

80,000

Explanation:

First, the diameters of both must be in the same unit. Converting the pinhead diameter from millimeter to nanometer, we get:

$2mm = 2*10^6$ nm

To get the number of polio viruses that fit at the head of the pin, divide the pin size by the amount of virus in nanometers:

$2*10^6 = 2,000,000$

$2,000,000 / 25 = 80,000$

This concludes that 80,000 polio viruses fit the pinhead.