Exam-style question
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What effect does increasing the energy of electrons in an electron microscope have on their de Broglie wavelength?.
- A.It increases the de Broglie wavelength.
- B.It decreases the de Broglie wavelength.
- C.It has no effect on the de Broglie wavelength.
- D.It makes the wavelength variable.
Model answer
What a good answer should say
- It decreases the de Broglie wavelength.
Explanation
Why this works
According to the de Broglie equation, as the energy of the electrons increases, their momentum increases, leading to a decrease in the de Broglie wavelength, which in turn enhances the resolution of the microscope.
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