JAMB Physics 2025 Objective — Question 39
Question 39 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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Work function is 3 eV. Light of frequency 8×10¹⁴ Hz strikes the metal. Max KE of photoelectrons:
- A. 0.2 eV
- B. 0.5 eV
- C. 0.3 eVCorrect
- D. 0.4 eV
Explanation
E_photon=hf≈3.315 eV; KE_max=3.315-3=0.315 eV≈0.3 eV.
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