Neco Model Questions Vol1 2017 Physics Question 45
Practice objective / multiple choice question 45 from the 2017 Neco Model Questions Vol1 Physics examination.
An electron is accelerated from rest through a potential difference of \(V_1 = 150\;\text{V}\) and then passes through a thin crystalline foil whose interplanar spacing is \(d = 0.20\;\text{nm}\). A first‑order diffraction maximum (\(n=1\)) is observed at a scattering angle of \(\theta = 30^{\circ}\).\n(i) Verify that the observed angle is consistent with the electron's de Broglie wavelength after the first acceleration.\n(ii) Determine the additional accelerating potential \(V_2\) (applied after the foil) required so that the electron's wavelength satisfies the second‑order diffraction condition (\(n=2\)) at the same angle \(\theta = 30^{\circ}\). Give \(V_2\) to the nearest volt.
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This is Neco Model Questions Vol1 2017 Physics Question 45. It is one of the objective questions from the 2017 Neco Model Questions Vol1 Physics examination.
Difficulty level: Hard .
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