Neco 2019 Physics Question 13

Practice objective / multiple choice question 13 from the 2019 Neco Physics examination.

Neco 2019 Physics Objective / Multiple Choice Hard Difficulty
Question 13 NECO • 2019 • PHYSICS • objective

A He\(^{+}\) ion (hydrogen‑like, \(Z=2\)) in the excited state \(n=5\) decays to \(n=2\) and emits a photon. The photon strikes a metal surface whose work function is \(\phi =4.0\,\text{eV}\). (a) Calculate the maximum kinetic energy of the emitted electrons. (b) If the same photon undergoes Compton scattering from a free electron at a scattering angle of \(180^{\circ}\), determine the wavelength shift \(\Delta\lambda\).

Answer Options

A. K_{max}=7.00 eV; \\Delta\\lambda=0.00550 nm
B. K_{max}=8.10 eV; \\Delta\\lambda=0.00420 nm
Correct Answer C. K_{max}=7.42 eV; \Delta\lambda=0.00486 nm
D. K_{max}=6.85 eV; \\Delta\\lambda=0.00512 nm
Correct Answer
C
Correct Option:
K_{max}=7.42 eV; \Delta\lambda=0.00486 nm

About This Question

This is Neco 2019 Physics Question 13. It is one of the objective questions from the 2019 Neco Physics examination.

Difficulty level: Hard .

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