Sodium and copper have work function 2.3 eV and 4.5 eV respectively. Then, the ratio of their threshold wavelength is nearest to-
A. 1 : 2
B. 4 : 1
C. 2 : 1
D. 1 : 4
Answer:C
Sodium and copper have work function 2.3 eV and 4.5 eV respectively. Then, the ratio of their threshold wavelength is nearest to-
A. 1 : 2 B. 4 : 1 C. 2 : 1 D. 1 : 4