Kavita photographs a cell through a microscope at a magnification of 400…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
Kavita photographs a cell through a microscope at a magnification of . On the photo, the cell is wide.
- What is the real width of the cell in millimetres?
- What is it in micrometres?
- Which kind of human cell is about this size?
Need a reminder? The key ideaShow
The cell theory: Schleiden (plants, 1838) and Schwann (animals, 1839) said that living things are made of cells; Virchow (1855) added that every cell comes from a cell. Hooke named cells, Leeuwenhoek first saw live cells and Brown found the nucleus. Image width equals real width times the magnification; 1000 µm make 1 mm.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. In millimetres. .
Step 2. In micrometres. .
Step 3. Which cell. A human red blood cell is about across.
Answer: ; ; a red blood cell.
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