Question

The diameter of a white blood cell under magnification appears to be 0.3 centimeters. What is the diameter of the white blood cell in millimeters?(A microscope has a scale of 250:1)

____millimeters

Answer 1

3 millimeters.

Explanation:

There are 10 millimeters in 1 centimeter.

So the answer is 0.3 * 10 = 3 millimeters.

Answer 2

Diameter of the cell will be 0.012 mm.

Explanation:

The diameter of a white blood cell under magnification was 0.3 centimeters.

Since 1 centimeter = 10 mm

Therefore, 0.3 cm = 0.3×10

= 3 mm

If a microscope has a scale of 250 : 1

Then diameter will be in the same ratio.

`\frac{\text{Diameter of the cell by microscope}}{\text{Original diameter of the cell}}` =
`(250)/(1)`

`\frac{3}{\text{Original diameter of the cell}}` =
`(250)/(1)`

Original diameter of the cell =
`(3)/(250)`

= 0.012 mm