JAMB Physics 2022 Objective — Question 36
Question 36 of 41 from the Joint Admissions and Matriculation Board (JAMB) Physics 2022 Objective paper, with the correct answer and a full explanation.
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Work function 2.56×10⁻¹⁹ J. Photon ejects electron with KE=3.0 eV. Frequency of photon:
- A. 1.12×10¹⁵ HzCorrect
- B. 2.2×10¹⁴ Hz
- C. 1.12×10⁻⁵³ Hz
- D. 4.4×10¹⁴ Hz
Explanation
E=W+KE=2.56×10⁻¹⁹+4.8×10⁻¹⁹=7.36×10⁻¹⁹; f=7.36×10⁻¹⁹/6.6×10⁻³⁴≈1.12×10¹⁵ Hz.
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