Neco 2025 Physics Question 45

Practice objective / multiple choice question 45 from the 2025 Neco Physics examination.

Neco 2025 Physics Objective / Multiple Choice Medium Difficulty
Question 45 NECO • 2025 • PHYSICS • objective

Metal A has a work function \(\phi_{A}=2.1\) eV. When illuminated with monochromatic light of wavelength \(\lambda=400\) nm, the measured stopping potential is \(V_{s}=1.0\) V. A second metal B, under the same illumination, gives a stopping potential of \(0.4\) V.\n\n(a) Determine the work function of metal B.\n(b) If metal B is illuminated with light of wavelength \(300\) nm, calculate the maximum kinetic energy of the emitted electrons (in eV and in joules).

Answer Options

A. φ_B = 2.70 eV; K_max = 1.20 eV (≈1.92×10⁻¹⁹ J)
B. φ_B = 2.50 eV; K_max = 1.63 eV (≈2.61×10⁻¹⁹ J)
C. φ_B = 2.90 eV; K_max = 1.23 eV (≈1.97×10⁻¹⁹ J)
Correct Answer D. φ_B = 2.70 eV; K_max = 1.43 eV (≈2.30×10⁻¹⁹ J)
Correct Answer
D
Correct Option:
φ_B = 2.70 eV; K_max = 1.43 eV (≈2.30×10⁻¹⁹ J)

About This Question

This is Neco 2025 Physics Question 45. It is one of the objective questions from the 2025 Neco Physics examination.

Difficulty level: Medium .

View More Neco 2025 Physics Questions More Neco Practice Questions Back to Questions

Master the Exam!

You've seen a preview, but there are thousands more questions plus AI tutor to break down complex solutions.

Unlock Full Access Available for Android & Windows
Chat with Support