Image size / real size. They should have the same unts, if not, convert them.
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A specimen is 50μm wide. Calculate the width of the image of the specimen under a magnification of x100. Give your answer in mm.
1) Rearange the formula - Image size = magnification x real size. 2) Fill in the values you know - Image size = 100 x 50. 3) Remember the units in your answer - = 5000μm. 4) Convert the units - = 5mm.
2 of 5
Exam Question: An onion cell is viewed under a microscope with x 100 magnification. The image of the cell is 7.5 mm wide. What is the real width of the onion cell? Give your answer in μm. [2 marks].
Real size = Image size / Magnification. = 7.5mm / 100. = 0.075 mm [1 mark]. 0.075 x 1000 = 75 μm [1 mark].
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Standard form is where you change very big or small numbers with lots of zeros into something more manageable e.g. 0.017 can be written as 1.7 × 10 to the power of minus 2. To do this you move the decimal left or right.
The number of places the decimal point moves is then represented by a power of 10 - positive if the decimal point's moved to the left, and negative if moved right.
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A mitochondrian is approximately 0.0025 mm long. Write this figure in standard form.
2.5 x 10 to the power of minus 3.
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Other cards in this set
Card 2
Front
A specimen is 50μm wide. Calculate the width of the image of the specimen under a magnification of x100. Give your answer in mm.
Back
1) Rearange the formula - Image size = magnification x real size. 2) Fill in the values you know - Image size = 100 x 50. 3) Remember the units in your answer - = 5000μm. 4) Convert the units - = 5mm.
Card 3
Front
Exam Question: An onion cell is viewed under a microscope with x 100 magnification. The image of the cell is 7.5 mm wide. What is the real width of the onion cell? Give your answer in μm. [2 marks].
Back
Card 4
Front
Standard form is where you change very big or small numbers with lots of zeros into something more manageable e.g. 0.017 can be written as 1.7 × 10 to the power of minus 2. To do this you move the decimal left or right.
Back
Card 5
Front
A mitochondrian is approximately 0.0025 mm long. Write this figure in standard form.
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