Igcse Model Questions Vol1 2017 Physics Question 3
Practice objective / multiple choice question 3 from the 2017 Igcse Model Questions Vol1 Physics examination.
A hydrogen atom is initially in the \(n = 5\) energy level. It makes a transition directly to the \(n = 2\) level, emitting a photon. The photon is completely absorbed by a stationary free electron, giving the electron kinetic energy equal to the photon energy. The electron then collides elastically and head‑on with a stationary proton. What is the speed of the proton after the collision? Give your answer in \(\text{m s}^{-1}\) to two significant figures.
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This is Igcse Model Questions Vol1 2017 Physics Question 3. It is one of the objective questions from the 2017 Igcse Model Questions Vol1 Physics examination.
Difficulty level: Hard .
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