Igcse Model Questions Vol1 2024 Physics Question 38

Practice objective / multiple choice question 38 from the 2024 Igcse Model Questions Vol1 Physics examination.

Igcse Model Questions Vol1 2024 Physics Objective / Multiple Choice Hard Difficulty
Question 38 IGCSE_MODEL_QUESTIONS_VOL1 • 2024 • PHYSICS • objective

An electron in a hydrogen atom makes a transition from the \(n=4\) level to the \(n=2\) level, emitting a photon. (a) The same photon is then absorbed by another hydrogen atom that is initially in the \(n=2\) state. To which energy level \(n\) is the electron in this second atom excited? (b) If the photon is instead incident on a metal surface with work function \(\phi = 2.0\ \text{eV}\), calculate the maximum kinetic energy of the emitted photoelectron and give its speed (use \(m_{e}=9.11\times10^{-31}\ \text{kg}\)).

Answer Options

Correct Answer A. a) n = 4; b) K_max = 0.55 eV (8.8×10⁻²⁰ J), speed ≈ 4.4×10⁵ m s⁻¹
B. a) n = 3; b) K_max = 0.45 eV (7.2×10⁻²⁰ J), speed ≈ 4.0×10⁵ m s⁻¹
C. a) n = 5; b) K_max = 0.65 eV (1.0×10⁻¹⁹ J), speed ≈ 4.8×10⁵ m s⁻¹
D. a) n = 6; b) K_max = 0.35 eV (5.6×10⁻²⁰ J), speed ≈ 3.5×10⁵ m s⁻¹
Correct Answer
A
Correct Option:
a) n = 4; b) K_max = 0.55 eV (8.8×10⁻²⁰ J), speed ≈ 4.4×10⁵ m s⁻¹

About This Question

This is Igcse Model Questions Vol1 2024 Physics Question 38. It is one of the objective questions from the 2024 Igcse Model Questions Vol1 Physics examination.

Difficulty level: Hard .

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