Gce Model Questions Vol1 2017 Physics Question 24

Practice objective / multiple choice question 24 from the 2017 Gce Model Questions Vol1 Physics examination.

Gce Model Questions Vol1 2017 Physics Objective / Multiple Choice Hard Difficulty
Question 24 GCE_MODEL_QUESTIONS_VOL1 • 2017 • PHYSICS • objective

An electron in a hydrogen atom makes a transition from the \(n=5\) level to the \(n=2\) level, emitting a photon. (a) Calculate the wavelength of the photon in vacuum. (b) The photon then passes through a gas that is moving directly away from the source at a speed of \(2.0\times10^{5}\ \text{m s}^{-1}\). Assuming the speed is much less than the speed of light, determine the observed wavelength after the Doppler shift. (c) Determine the energy difference between the two levels in electron‑volts.

Answer Options

A. a) 410 nm; b) 410.5 nm; c) 2.45 eV
B. a) 438 nm; b) 438.5 nm; c) 2.70 eV
C. a) 450 nm; b) 450.2 nm; c) 3.10 eV
Correct Answer D. a) 434 nm; b) 434.3 nm; c) 2.86 eV
Correct Answer
D
Correct Option:
a) 434 nm; b) 434.3 nm; c) 2.86 eV

About This Question

This is Gce Model Questions Vol1 2017 Physics Question 24. It is one of the objective questions from the 2017 Gce Model Questions Vol1 Physics examination.

Difficulty level: Hard .

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