Neco Model Questions Vol1 2021 Physics Question 35

Practice objective / multiple choice question 35 from the 2021 Neco Model Questions Vol1 Physics examination.

Neco Model Questions Vol1 2021 Physics Objective / Multiple Choice Hard Difficulty
Question 35 NECO_MODEL_QUESTIONS_VOL1 • 2021 • PHYSICS • objective

An electron in a hydrogen atom drops from the \(n=5\) level to the \(n=2\) level, emitting a photon.\n(a) Calculate the wavelength of the emitted photon.\n(b) The photon is incident on a metal surface whose work function is \(\phi = 2.0\) eV. Determine the maximum kinetic energy of the emitted photo‑electron.\n(c) The photo‑electron is then accelerated through a potential difference of \(150\) V. Find its final speed. Give all speeds in \(\text{m s}^{-1}\) to three significant figures.

Answer Options

Correct Answer A. a) 434 nm; b) 0.856 eV (1.37×10⁻¹⁹ J); c) 7.28×10⁶ m/s
B. a) 500 nm; b) 0.95 eV (1.52×10⁻¹⁹ J); c) 8.10×10⁶ m\/s
C. a) 410 nm; b) 0.70 eV (1.12×10⁻¹⁹ J); c) 6.90×10⁶ m\/s
D. a) 450 nm; b) 1.10 eV (1.76×10⁻¹⁹ J); c) 7.80×10⁶ m\/s
Correct Answer
A
Correct Option:
a) 434 nm; b) 0.856 eV (1.37×10⁻¹⁹ J); c) 7.28×10⁶ m/s

About This Question

This is Neco Model Questions Vol1 2021 Physics Question 35. It is one of the objective questions from the 2021 Neco Model Questions Vol1 Physics examination.

Difficulty level: Hard .

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