B1: Quiz 4

1)

a) With respect to microscopes, what does magnification mean?

b) With respect to microscopes, what does resolution mean?

2)

a) Out of light microscopes and electron microscopes, which have:

i) the higher magnification

ii) the higher resolution

b) Why did the discovery of electron microscopes allow scientists to learn more about the different subcellular structures in cells?

3) Write an equation that links magnification, image size and real size.

4) I look at a bacterium under a microscope with a magnification of 100. The length of the bacterium under the microscope is 4.5 mm (image size). Work out the real size of the bacterium. Give your answer in mm.

5) A plant cell has a real size of 0.012 mm. I look at the plant cell through a microscope with a magnification of x400. Work out the image size. Give your answer in mm.

6) A cell has a real size of 0.014 mm. When I look at the cell through a microscope with an unknown magnification, the cell has a size of 8.4 mm. Find the magnification of the microscope.

7) The real size of a cell is 15 μm. When I look at the cell through a microscope with an unknown magnification, the cell has a size of 7.5 mm. Find the magnification of the microscope. *Make sure that the units for the values are the same. *

8) A subcellular structure when looked at through a microscope with a x4,000 magnification is 24 μm in length. Calculate the real length of the subcellular structure. Give your answer in nanometres.

9) A subcellular structure when looked at through a microscope with a magnification of x700,000 has a length of 18.2 mm. Calculate the real length of the subcellular structure. Give your answer in nm.

10) A part of a specimen is 1.6 x 10^{-9} m in real life. I look at the specimen through a microscope with a magnification of x5,000. Calculate the size of the part of the specimen in the image under the microscope. Give your answer in metres and in standard form.