Igcse Model Questions Vol1 2024 Physics Question 5

Practice objective / multiple choice question 5 from the 2024 Igcse Model Questions Vol1 Physics examination.

Igcse Model Questions Vol1 2024 Physics Objective / Multiple Choice Hard Difficulty
Question 5 IGCSE_MODEL_QUESTIONS_VOL1 • 2024 • PHYSICS • objective

A hydrogen atom makes a transition from the \(n = 5\) level to the \(n = 2\) level, emitting a photon. The photon is incident on a diffraction grating that has \(5.8 \times 10^{5}\) lines per metre. A second‑order (\(m = 2\)) maximum is observed at an angle of \(30^{\circ}\) to the normal of the grating. (a) Calculate the wavelength of the emitted photon. (b) Determine the energy of the photon in joules and in electronvolts. (c) Find the grating spacing \(d\). (d) Verify that the observed angle is consistent with the second‑order diffraction condition using the wavelength obtained in part (a).

Answer Options

A. λ = 4.34×10⁻⁷ m (434 nm); E = 4.58×10⁻¹⁹ J = 2.86 eV; d = 1.45×10⁻⁶ m; predicted θ ≈ 30.2° confirming the observation
Correct Answer B. λ = 4.34×10⁻⁷ m (434 nm); E = 4.58×10⁻¹⁹ J = 2.86 eV; d = 1.72×10⁻⁶ m; predicted θ ≈ 30.2° confirming the observation
C. λ = 5.12×10⁻⁷ m (512 nm); E = 3.88×10⁻¹⁹ J = 2.42 eV; d = 1.72×10⁻⁶ m; predicted θ ≈ 35.0° confirming the observation
D. λ = 3.90×10⁻⁷ m (390 nm); E = 5.10×10⁻¹⁹ J = 3.19 eV; d = 1.72×10⁻⁶ m; predicted θ ≈ 28.5° confirming the observation
Correct Answer
B
Correct Option:
λ = 4.34×10⁻⁷ m (434 nm); E = 4.58×10⁻¹⁹ J = 2.86 eV; d = 1.72×10⁻⁶ m; predicted θ ≈ 30.2° confirming the observation

About This Question

This is Igcse Model Questions Vol1 2024 Physics Question 5. It is one of the objective questions from the 2024 Igcse Model Questions Vol1 Physics examination.

Difficulty level: Hard .

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