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

Answer:

3 millimeters.

Step-by-step explanation:

There are 10 millimeters in 1 centimeter.

So the answer is 0.3 * 10 = 3 millimeters.

Answer 2

Answer:

Diameter of the cell will be 0.012 mm.

Step-by-step 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.

$\frac{\text{Diameter of the cell by microscope}}{\text{Original diameter of the cell}}$ = $\frac{250}{1}$

$\frac{3}{\text{Original diameter of the cell}}$ = $\frac{250}{1}$

Original diameter of the cell = $\frac{3}{250}$

                                               = 0.012 mm