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