Question

QUESTION 8 Electronicroscopes have electron guns, but all do not have electron collectors. O True O False

Answer 1

Electron microscopes have electron guns, but all do not have electron collectors.

There are two parts in above statement. First part of the statement says that electron microscopes have electron guns. Second part of the statement says that all elctron microscopes do not have electron collectors.

Electron guns generate electron beam. Elelctron microscopes use electron beam generated from electron gun to form image of the specimen. Both Scanning Electron Microscope (SEM) and Transmission Electron Microscope (TEM) have electron guns. Hence, first part of the statement saying that slectron microscopes have electron guns is true.

In SEM, electron detectors collect secondary electrons emitted from sureface of specimen scanned by beam of electrons.Electron detectors are collectors for secondary eectrons.They form images of surface features of specimen trgeted by electron beam. But, TEM is based on transmission of electrons through the sample. These transmitted electrons form image of specimen on a flourescence screen. TEM does not contain electron collectors. Hence, second part of the statement saying that all elctron microscopes do not have electron collectors is also true.

From above explanation it is clear that both parts of the statement given in question are true. Hence, statement given in question is true.