Dual Nature of Radiation and Matter

Question: Sodium and copper have work functions 2.3$eV$and 4.5$eV$ respectively. Then the ratio of their threshold wavelengths is nearest to



1) 1: 2
2) 4 : 1
3) 2 : 1
4) 1 : 4
Solution: Explanation: No Explanation
Photon and Photoelectric Effect

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