Question

select one option

Why must scanning electron microscopes operate under vacuum?

1-To prevent the electromagnetic lenses from heating up

2-To prevent samples from degrading

3-To stop the scattering of high energy electrons of the beam

4-All of the above​

Answer 1

Answer:

3) to stop the scattering of high energy electrons of the beam

Explanation:

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Answer 2

Answer:

it's 4 is the correct option