To explain the advantages of using an Electron Microscope To be able to carry out Simple Magnification Calculations ID: 1046892
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1. Success CriteriaTo be able to describe how a Light and Electron Microscope work To explain the advantages of using an Electron Microscope To be able to carry out Simple Magnification Calculations. MicroscopesKeywordsMagnification, Resolution, Clarity Activities Table comparing light and electron microscopesMagnification calculations
2. Under a light microscope, cells look a bit like this...What type of cell is this? Why?X 100 mag
3. Under an electron microscope…
4. Light microscopeElectron MicroscopeLight passes through the specimen and then through the magnifying lenses so you can see the object much biggerPasses a beam of electrons through the specimen to magnify it Magnificationx1500MagnificationX2 000 000
5. Light microscopeElectron MicroscopeMuch cheaper but lower magnificationMore expensive more high magnificationGives a higher resolution.This means you can tells the difference between 2 objects even if they are really close together.Magnificationx1500MagnificationX2 000 000
6. A light microscope shows us bacteria don't have a nucleusAn electron microscope shows us that bacteria have two types of DNA, chromosomal and plasmid DNA.
7. Task one- To find out about the two types of microscopes.Draw a table.Use the information on slides before and your own research to completeLight MicroscopeElectron MicroscopeHow does the microscope work?AdvantagesDisadvantagesMagnification
8. What are the advantages of using an Electron Microscope?
9. What are the advantages of using an Electron Microscope?Better magnificationCan see image more clearlyHigh resolutionThis means the ability to distinguish between 2 points
10. MagnificationStudy the eight images of objects. Most of them can only be seen when magnified by a light microscope or electron microscope.Task 1Rank the images in order from smallest to largest.
11.
12. MagnificationStudy the eight images of objects. Most of them can only be seen when magnified by a light microscope or electron microscope.Task 1Rank the images in order from smallest to largest.View the animation from cells alive to check your order. http://www.cellsalive.com/howbig.htm
13. MagnificationMagnification = Measured size Actual size
14. ObjectImage SizeActual sizeMagnificationE Coli20mm0.002mm xYeast Cell10mm0.006mm xBlood cell300mm0.01mm xPollen Grain40mm0.5mm xHair6cm3.5cm xObjectImage SizeActual sizeMagnificationSalmonella1.5cm0.003mm xCrystal3cm0.05mm xWhite Cell20mm20µm xDust25mm0.1cm xFinger Nail5mm1.5cm xEasier – Same units of measurementDifficult – Different units of measurement20 ÷ 0.002 = x10,000 10 ÷ 0.006 = x1,666.67 300 ÷ 0.01 = x30,000 40 ÷ 0.5 = x80 6 ÷ 3.5 = x1.7 15mm ÷ 0.003mm = x5030mm ÷ 0.05mm = x60020,000µ ÷ 2020µm = x100025mm ÷ 201mmm = x255mm ÷ 2015mmm = x0.3