Waec Model Questions Vol1 2021 Physics Question 3
Practice objective / multiple choice question 3 from the 2021 Waec Model Questions Vol1 Physics examination.
A hydrogen atom initially at rest in vacuum emits a photon when an electron drops from the n=3 to the n=2 level. (a) Calculate the wavelength of the emitted photon. (b) Using conservation of momentum, determine the recoil speed of the hydrogen atom after the emission. (Use R=1.097×10⁷ m⁻¹, h=6.626×10⁻³⁴ J·s, c=3.00×10⁸ m s⁻¹, and the mass of a hydrogen atom 1.67×10⁻²⁷ kg.)
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This is Waec Model Questions Vol1 2021 Physics Question 3. It is one of the objective questions from the 2021 Waec Model Questions Vol1 Physics examination.
Difficulty level: Hard .
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