Neco Model Questions Vol1 2021 Physics Question 18
Practice objective / multiple choice question 18 from the 2021 Neco Model Questions Vol1 Physics examination.
A hydrogen atom in its first excited state (\(n=2\)) absorbs a photon and is promoted to the \(n=4\) level. It then returns to the ground state (\(n=1\)) by either (i) a direct transition \(4\rightarrow1\) or (ii) a cascade of three transitions \(4\rightarrow3\), \(3\rightarrow2\), and \(2\rightarrow1\). Assuming the atom is initially at rest, calculate the difference in recoil kinetic energy of the atom between the two decay routes. Use the hydrogen energy formula \(E_n = -\dfrac{13.6\ \text{eV}}{n^{2}}\) and the atomic mass of hydrogen \(m_{\text{H}} = 1.6735\times10^{-27}\ \text{kg}\). Give your answer in joules (expressed in scientific notation to two significant figures).
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This is Neco Model Questions Vol1 2021 Physics Question 18. It is one of the objective questions from the 2021 Neco Model Questions Vol1 Physics examination.
Difficulty level: Hard .
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