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6. How so SEM's work?
They scan a beam of electrons across the specimen. This knocks off electrons from the specimen, which are gathered in a cathode ray tube to form an image.
They screen a beam of electrons across a specimen. This knocks off the electrons from the specimen, which are gathered in a cathode ray tube to form an image.
7. What organelles CANNOT be viewed by an Optical microscope?
smaller organelles- ribosomes, endoplasmic reticulum, lysosomes.
nucleus, mitochondria.
8. How does an Optical microscope work?
They use light to form an image.
They use electrons to form an image.
9. What is good about SEM's?
SEM's can be used on thick specimens.
SEM's are quicker and easier to use.
10. Why aren't TEM's good at viewing living organisms?
Because the living organism wont fit under a microscope slide.
Because you have to view the specimen in a vacuum.
Because the living organism wont stay still.
11. What is the maximum useful magnification of an Optical microscope?
12. How does an Electron microscope work?
They use electrons to form an image.
They use light to form an image.
13. DO SEM's produce 2-D or 3-D images?
They can produce 3-D images.
They can only produce 2-D images.
14. Do SEM's give a lower or higher resolution than TEM's?
SEM's give a lower resolution than TEM's.
SEM's give a higher resolution than TEM's.
SEM's have the same resolution as TEM's.
15. Do electron microscopes produce a black/white image or a coloured image?
They produce a black/white image, however they can be coloured by a computer.
They produce a coloured image.
16. What are the two types of electron microscopes called?
Transfer electron microscope and Scanning electron microscope.
Transmission electron microscopes and Scanning electron microscope.
Transmission electron microscope and Screening electron microscope.
17. What is the maximum resolution of an Optical microscope?
0.3 micrometres (approximately)
0.2 micrometres (approximately)
1.0 micrometres (approximately)
0.5 micrometres (approximately)
18. Why are TEM's good?
They give high resolution images , so you can see the internal structure of the organelles. Such as chloroplasts.
They give coloured images and you can see smaller organelles.
19. What is the benefit of a higher resolution?
You get a brighter image.
You get a more detailed image, meaning you can look at more organelles.
You get a coloured image.
