JAMB Physics 2025 Objective — Question 34
Question 34 of 40 from the Joint Admissions and Matriculation Board (JAMB) Physics 2025 Objective paper, with the correct answer and a full explanation.
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The work function of a metal is 2.0 eV. The threshold frequency for photoemission is:
- A. 2.4×10¹⁴ Hz
- B. 4.8×10¹⁴ HzCorrect
- C. 3.2×10¹⁵ Hz
- D. 6.6×10¹³ Hz
Explanation
f₀=W/h=(2×1.6×10⁻¹⁹)/(6.63×10⁻³⁴)≈4.8×10¹⁴ Hz.
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