Neco 2021 Physics Question 45
Practice objective / multiple choice question 45 from the 2021 Neco Physics examination.
In a hydrogen atom an electron makes a transition from the \(n=5\) level to the \(n=2\) level.\n(i) Calculate the wavelength of the photon emitted in this transition (give your answer in nanometres, to three significant figures).\n(ii) The photon then passes through a gas that is moving away from the source at \(3\times10^{5}\ \text{m s}^{-1}\). Assuming a non‑relativistic Doppler shift, determine the wavelength observed after the gas, again to three significant figures.
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About This Question
This is Neco 2021 Physics Question 45. It is one of the objective questions from the 2021 Neco Physics examination.
Difficulty level: Hard .
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