A monochromatic light beam with a quantum energy of 9.0 eV is incident upon a photocell. The work function of the photocell is 4.1 eV. What is the maximum kinetic energy of the electron?
A. 4.2 eV
B. 4.4 eV
C. 4.7 eV
D. 4.9 eV
Answer: C. 4.7 eV
A monochromatic light beam with a quantum energy of 9.0 eV is incident upon a photocell. The work function of the photocell is 4.1 eV. What is the maximum kinetic energy of the electron?
