Gce Model Questions Vol1 2022 Physics Question 7

Practice objective / multiple choice question 7 from the 2022 Gce Model Questions Vol1 Physics examination.

Gce Model Questions Vol1 2022 Physics Objective / Multiple Choice Hard Difficulty
Question 7 GCE_MODEL_QUESTIONS_VOL1 • 2022 • PHYSICS • objective

A hydrogen atom in its ground state absorbs a photon of wavelength \(90\,\text{nm}\). (a) Identify the principal quantum number \(n\) of the excited state reached. (b) If instead the atom absorbs a photon of wavelength \(70\,\text{nm}\), the electron is ejected. Calculate the kinetic energy of the ejected electron in electron‑volts. (c) The free electron then passes through a uniform electric field that accelerates it through a potential difference of \(5\,\text{V}\). Determine its final speed in metres per second (give two significant figures).

Answer Options

Correct Answer A. n = 5; K = 4.13 eV; final speed ≈ 1.8×10⁶ m/s
B. n = 4; K = 3.90 eV; final speed ≈ 1.6×10⁶ m/s
C. n = 5; K = 5.00 eV; final speed ≈ 2.0×10⁶ m/s
D. n = 6; K = 4.50 eV; final speed ≈ 1.9×10⁶ m/s
Correct Answer
A
Correct Option:
n = 5; K = 4.13 eV; final speed ≈ 1.8×10⁶ m/s

About This Question

This is Gce Model Questions Vol1 2022 Physics Question 7. It is one of the objective questions from the 2022 Gce Model Questions Vol1 Physics examination.

Difficulty level: Hard .

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