Neco Model Questions Vol1 2022 Physics Question 8
Practice objective / multiple choice question 8 from the 2022 Neco Model Questions Vol1 Physics examination.
In a hydrogen discharge tube an electron is accelerated through a potential difference \(V\) and collides with a stationary hydrogen atom, exciting it from the ground state \(n=1\) to the first excited state \(n=3\). The collision is perfectly inelastic, so after the excitation the electron and the hydrogen atom move together. (a) Determine the minimum accelerating voltage \(V_{\min}\) required for this excitation. (b) After excitation the atom returns to the ground state by emitting two photons in a cascade: \(n=3\rightarrow2\) and \(2\rightarrow1\). Calculate the wavelengths of these two photons. (Use \(13.6\) eV for the hydrogen ionisation energy and \(hc=1240\) eV·nm.)
Answer Options
About This Question
This is Neco Model Questions Vol1 2022 Physics Question 8. It is one of the objective questions from the 2022 Neco Model Questions Vol1 Physics examination.
Difficulty level: Hard .
Master the Exam!
You've seen a preview, but there are thousands more questions plus AI tutor to break down complex solutions.