Neco 2020 Physics Question 3
Practice objective / multiple choice question 3 from the 2020 Neco Physics examination.
Electrons are accelerated from rest through a potential difference of \(150\ \text{V}\) and then strike a thin polycrystalline metal foil. The first‑order diffraction maximum is observed at an angle of \(30^{\circ}\) relative to the incident beam. Using the de Broglie relation and Bragg's law for first order (\(n=1\)), determine the interplanar spacing \(d\) of the crystal in nanometres.
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About This Question
This is Neco 2020 Physics Question 3. It is one of the objective questions from the 2020 Neco Physics examination.
Difficulty level: Hard .
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