B1.1 World of the microscope

• Created by: abiiwelsh
• Created on: 06-09-18 18:01
How many metres are in 1 nanometre?
0.000000001 m or 1 x 10^-9 or 1 trillionth of a metre
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How can you work out how many nanometres are in a meter?
Multiply 1000 by 1000 because there are 1000 nm in micrometer and 1000 micrometers in 1mm, then times by 10 because there are 10mm in 1cm, then times by 100 because 100cm in 1m. Answer equals 1,000,000,000 (1 trillion)
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How many nanometres in 1 micrometer?
1000 nm
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How many micrometers in 1mm?
1000 micrometers
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What fraction of a meter is 1 micrometer?
1 millionth of a meter
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When was first light microscope?
17th century
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What is the max magnification of light microscopes?
X2000
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What are advantages of light microscopes?
Cheap, used anywhere and schools, magnify live specimen
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How do light microscopes form image?
Beams of light
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When was electron microscope?
1930s
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What are advantages of electron microscopes?
Understand subcellular structures, magnify up to x2,000,000,000
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How are images formed with electron microscope?
Beam of electrons
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What is transmission electron microscope?
2D, very magnified, high resolution (detail)
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What is scanning electron microscope?
3D, less magnifying
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What are limitations of electron microscopes?
Large, expensive, special temperature, pressure, humidity
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How do you calculate magnification on light microscopes and when should you use it?
Eye piece lens x objective lens and use it for labelling microscope drawings
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What is the equation for calculating size of real object from microscope?
Size of real object = image size / magnification
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What is the resolving power?
The ability a microscope has to distinguish between 2 separate points. Higher resolving power the smaller the distance between the 2 points can be to distinguish
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What is the resolving power of light microscope compared to electron microscope?
Light microscope: 200nm, scanning electron: 10nm, transmission: 0.2nm
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Other cards in this set

Card 2

Front

How can you work out how many nanometres are in a meter?

Back

Multiply 1000 by 1000 because there are 1000 nm in micrometer and 1000 micrometers in 1mm, then times by 10 because there are 10mm in 1cm, then times by 100 because 100cm in 1m. Answer equals 1,000,000,000 (1 trillion)

Card 3

Front

How many nanometres in 1 micrometer?

Card 4

Front

How many micrometers in 1mm?

Card 5

Front

What fraction of a meter is 1 micrometer?