BI-2174
Measuring length
Biology · Secondary 4 · Medium · Measuring length
A photomicrograph of a plant cell is labelled with a line MN across its diameter. The measured length of MN on the image is 20 mm. The magnification is ×500. What is the actual diameter of the cell, in mm, to two significant figures?
- 0.0040 mm
- 0.040 mm
- 0.40 mm
- 4.0 mm
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