Sodium and copper have photoelectric work functions 2.3 eV and 4.7 eV, – InterviewSolution

1.	Sodium and copper have photoelectric work functions 2.3 eV and 4.7 eV, respectively. The ratio λ0Na /λ0Cu 0f the threshold wavelengths for photoemission is about(A) 1 : 4 (B) 1 : 2 (C) 2 : 1 (D) 4 : 1.
Answer» Correct option is (C) 2 : 1

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