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The maximum KE of photoelectrons emitted...

The maximum KE of photoelectrons emitted from a cetain metallic surface is 30 eV when monochromatic radiation of wavelength `lamda` falls on it. When the same surface is illuminated with light of wavelength `2lamda`, the minimum KE of photoelectrons is found to be 10 eV. (a) Calculate the wavelength `lamda` and (b) determine the maximum wavelength of incident radiation for which photoelectric emission is possible.

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