Gce Model Questions Vol1 2021 Physics Question 5

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

Gce Model Questions Vol1 2021 Physics Objective / Multiple Choice Hard Difficulty
Question 5 GCE_MODEL_QUESTIONS_VOL1 • 2021 • PHYSICS • objective

Monochromatic light of wavelength 400 nm shines on a metal surface with work function 2.0 eV. The incident intensity is 1.0 W m\(^{-2}\). A parallel‑plate capacitor of area \(1.0\;\text{cm}^2\) and plate separation 2.0 mm is placed so that the emitted photoelectrons are collected on the opposite plate. (a) Calculate the maximum kinetic energy of the emitted electrons in electron‑volts. (b) Assuming each incident photon ejects one electron, find the saturation current produced (in amperes). (c) How long will it take for the capacitor to reach a potential difference of 100 V? Give your answer in microseconds to two significant figures.

Answer Options

A. Kmax = 0.95 eV; I_sat = 2.8×10⁻⁵ A; t = 1.6 µs
Correct Answer B. Kmax = 1.10 eV; I_sat = 3.2×10⁻⁵ A; t = 1.4 µs
C. Kmax = 1.25 eV; I_sat = 3.8×10⁻⁵ A; t = 1.2 µs
D. Kmax = 0.80 eV; I_sat = 4.5×10⁻⁵ A; t = 2.0 µs
Correct Answer
B
Correct Option:
Kmax = 1.10 eV; I_sat = 3.2×10⁻⁵ A; t = 1.4 µs

About This Question

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

Difficulty level: Hard .

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