The maximum kinetic energy of photoelectrons emitted from a metalic surface is 30 eV when monochromatic radiation of wavelength falls on it. When the same surface is illuminated with light of wavelength `2lambda`the maximum kinetic energy photo electrons is observed to be 10 eV Calculate the wavelength `lambda` and determine the maximum wavelength of incident radiation for which photoelectrons can be emitted by this surface, `(h = 6.62 xx 10^(-34) JS =4.14 xx 10^(-15) eV-s. c = 3 xx 10^(8) m//s)`
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