Q. When the energy of the incident radiation is increased by 20% the kinetic energy of the photoelectrons emitted from a metal surface increased from 0.5 eV to 0.8 eV. The work function of the metal is :
A) 0.65 eV
B) 1.0 eV
C) 1.3 eV
D) 1.5 eV
Explanation
[Solution] E = 0.5 + φ and 1.2E = 0.8 + φ ⇒ 0.2E = 0.3, E = 1.5 eV, φ = 1.0 eV. Answer (2).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.