Igcse Model Questions Vol1 2022 Physics Question 29
Practice objective / multiple choice question 29 from the 2022 Igcse Model Questions Vol1 Physics examination.
Electrons are accelerated from rest through a potential difference of \(1500\ \text{V}\) and then directed onto a thin crystal whose lattice spacing is \(d = 0.20\ \text{nm}\). The first‑order diffraction maximum is observed at an angle \(\theta\) to the incident beam. Assuming the electron wave obeys the de Broglie relation \(\lambda = h/p\) and Bragg's law \(n\lambda = 2d\sin\theta\) with \(n=1\), calculate \(\theta\) in degrees. Use \(h = 6.626\times10^{-34}\ \text{J·s}\), \(m_e = 9.11\times10^{-31}\ \text{kg}\), and \(e = 1.602\times10^{-19}\ \text{C}\). Give your answer to one decimal place.
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This is Igcse Model Questions Vol1 2022 Physics Question 29. It is one of the objective questions from the 2022 Igcse Model Questions Vol1 Physics examination.
Difficulty level: Hard .
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