Q.

Which of the following are true for electron microscopy?

A. specimen should be thin and dry
B. image is obtained on a phosphorescent screen
C. electron beam must pass through evacuated chamber
D. specimen should be thin and dry, image is obtained on a phosphorescent screen and electron beam must pass through evacuated chamber
Answer» D. specimen should be thin and dry, image is obtained on a phosphorescent screen and electron beam must pass through evacuated chamber
Explanation: since electrons can travel only in high vacuum, the entire electron path through the instrument must be evacuated; specimens must be completely dehydrated prior to
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