Neco Model Questions Vol1 2025 Physics Question 42
Practice objective / multiple choice question 42 from the 2025 Neco Model Questions Vol1 Physics examination.
An electron in a hydrogen atom makes a transition from the \(n = 5\) level to the \(n = 2\) level, emitting a photon. The atom is moving directly away from a detector with a speed of \(2.0\times10^{5}\) m s\(^{-1}\). Using the Rydberg constant \(R = 1.097\times10^{7}\ \text{m}^{-1}\), determine the wavelength of the photon as measured by the detector. Give your answer in nanometres (nm) to one decimal place.
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This is Neco Model Questions Vol1 2025 Physics Question 42. It is one of the objective questions from the 2025 Neco Model Questions Vol1 Physics examination.
Difficulty level: Hard .
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