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sara1234 Group Title

HELP

  • one year ago
  • one year ago

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  1. sara1234 Group Title
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    this is what i got- Scanning electron microscopes (SEM) are useful for studying the details of a specimen’s surface. The electron beam scans the specimen’s surface, which is coated with a thin layer of gold metal. The electrons that scatter off of the gold-coated surface are focused onto a screen, forming a detailed image of the specimen surface. The image is three-dimensional and black and white.

    • one year ago
  2. sara1234 Group Title
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    Its's between A or B

    • one year ago
  3. Peter14 Group Title
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    it's not A. The electron beam is scattered off the gold-coated surface, it doesn't pass through the specimen.

    • one year ago
  4. sara1234 Group Title
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    do you mean it's not B because B say it's passed not a?

    • one year ago
  5. Peter14 Group Title
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    oh, sorry. It is not absorbed by the specimen.

    • one year ago
  6. Peter14 Group Title
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    it is B, see how B talks about focusing the scattered electrons onto a screen?

    • one year ago
  7. sara1234 Group Title
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    therefore it's B?

    • one year ago
  8. Peter14 Group Title
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    yes if I were you, I would read this for awhile just for background knowledge

    • one year ago
  9. Peter14 Group Title
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    http://en.wikipedia.org/wiki/Scanning_electron_microscope

    • one year ago
  10. Peter14 Group Title
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    @sara1234 anything else you need help with?

    • one year ago
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