The Electron Microscope (AQA A-Level Biology): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
Why do electron beams provide better resolution than light in microscopy?
Why do electron beams provide better resolution than light in microscopy?
They have a much shorter wavelength
How much better is the resolution of modern electron microscopes compared to light microscopes?
How much better is the resolution of modern electron microscopes compared to light microscopes?
2000 times better
Why must specimens be placed in a near-vacuum for electron microscopy?
Why must specimens be placed in a near-vacuum for electron microscopy?
Electrons interact with air molecules
What is used to focus the electron beam in an electron microscope?
What is used to focus the electron beam in an electron microscope?
Electromagnets
What is the resolving power of a transmission electron microscope (TEM)?
What is the resolving power of a transmission electron microscope (TEM)?
What is the resolving power of a scanning electron microscope (SEM)?
What is the resolving power of a scanning electron microscope (SEM)?
Around
How is contrast created in TEM images?
How is contrast created in TEM images?
Differential electron absorption
What are artefacts in electron microscopy?
What are artefacts in electron microscopy?
Artificial features from preparation
What type of images do TEM and SEM produce?
What type of images do TEM and SEM produce?
TEM: 2-D images; SEM: 3-D images
Why do SEM specimens not need to be extremely thin unlike TEM specimens?
Why do SEM specimens not need to be extremely thin unlike TEM specimens?
Electrons don't penetrate in SEM