Electron microscopes (AQA A-Level Physics): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
What does the resolving power of a microscope depend on?
What does the resolving power of a microscope depend on?
Wavelength of illumination source
Why do electron microscopes have higher resolving power than optical microscopes?
Why do electron microscopes have higher resolving power than optical microscopes?
Electron wavelength is shorter than light
In de Broglie's equation , what does represent?
In de Broglie's equation , what does represent?
Planck's constant
How can the resolving power of an electron microscope be improved?
How can the resolving power of an electron microscope be improved?
Increase the accelerating voltage
What type of lenses does a TEM use to focus the electron beam?
What type of lenses does a TEM use to focus the electron beam?
Magnetic lenses
Which lens in a TEM projects the final image onto a fluorescent screen?
Which lens in a TEM projects the final image onto a fluorescent screen?
Projector lens
How do thicker samples affect TEM resolution?
How do thicker samples affect TEM resolution?
They reduce resolution by slowing electrons
What is the approximate scale of atomic resolution mentioned for electron microscopes?
What is the approximate scale of atomic resolution mentioned for electron microscopes?
nm
What physical phenomenon does a scanning tunnelling microscope (STM) use?
What physical phenomenon does a scanning tunnelling microscope (STM) use?
Quantum tunnelling of electrons
In constant height mode of STM, what creates the image?
In constant height mode of STM, what creates the image?
Variations in tunnelling current