A photoelectric surface is illuminated successively by monochromatic light of wavelengths \[\lambda \] and\[\frac{\lambda }{2}.\] If the maximum kinetic energy of the emitted photoelectrons in the second case is 3 times that in the first case, the work function of the surface is:

• A. \[\frac{hc}{2\lambda }\]
• B. \[\frac{hc}{\lambda }\]
• C. \[\frac{hc}{3\lambda }\]
• D. \[\frac{3hc}{\lambda }\]