Igcse Model Questions Vol1 2021 Physics Question 5

Practice objective / multiple choice question 5 from the 2021 Igcse Model Questions Vol1 Physics examination.

Igcse Model Questions Vol1 2021 Physics Objective / Multiple Choice Hard Difficulty
Question 5 IGCSE_MODEL_QUESTIONS_VOL1 • 2021 • PHYSICS • objective

A hydrogen atom makes a transition from the \(n=4\) level to the \(n=2\) level, emitting a photon. (a) Calculate the wavelength of the emitted photon (give answer in nanometres). (b) Using the Bohr model, find the radius of the electron's orbit in the \(n=4\) state (express in metres). (c) If a uniform magnetic field of \(2.0\ \text{T}\) is applied perpendicular to the plane of the orbit, compute the magnetic force on the electron moving in that orbit.

Answer Options

A. Wavelength = 410 nm; orbit radius = 1.69×10⁻⁹ m; magnetic force ≈ 2.2×10⁻¹³ N
B. Wavelength = 656 nm; orbit radius = 2.12×10⁻⁹ m; magnetic force ≈ 9.0×10⁻¹³ N
C. Wavelength = 434 nm; orbit radius = 5.29×10⁻¹¹ m; magnetic force ≈ 3.5×10⁻¹³ N
Correct Answer D. Wavelength = 486 nm; orbit radius = 8.46×10⁻¹⁰ m; magnetic force ≈ 1.76×10⁻¹³ N
Correct Answer
D
Correct Option:
Wavelength = 486 nm; orbit radius = 8.46×10⁻¹⁰ m; magnetic force ≈ 1.76×10⁻¹³ N

About This Question

This is Igcse Model Questions Vol1 2021 Physics Question 5. It is one of the objective questions from the 2021 Igcse Model Questions Vol1 Physics examination.

Difficulty level: Hard .

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