Waec Model Questions Vol1 2019 Physics Question 14
Practice objective / multiple choice question 14 from the 2019 Waec Model Questions Vol1 Physics examination.
An electron in a hydrogen atom is initially in the n = 3 level. It absorbs a photon and jumps to the n = 5 level. It is then ionized by absorbing another photon of wavelength λ. (Take R = 1.097 × 10⁷ m⁻¹, h = 6.626 × 10⁻³⁴ J s, c = 3.00 × 10⁸ m s⁻¹, and 1 eV = 1.602 × 10⁻¹⁹ J.) After ionization, the free electron is accelerated through a potential difference of 150 V. Determine (i) the wavelength λ of the ionizing photon (in nm) and (ii) the de Broglie wavelength of the accelerated electron (in pm).
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About This Question
This is Waec Model Questions Vol1 2019 Physics Question 14. It is one of the objective questions from the 2019 Waec Model Questions Vol1 Physics examination.
Difficulty level: Hard .
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