Q. If the threshold wavelength for sodium is $5420\ \mathring{\mathrm{A}},$ then the work function of sodium is
A) $4.58\ eV$
B) $2.28\ eV$
C) $1.14\ eV$
D) $0.23\ eV$
Explanation
(b) $W_{0} = \frac{12375}{\lambda_{0}} = \frac{12375}{5420} = 2.28eV$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.