TS EAMCET 11-Sep-2020 Shift 2 Solved Paper

A monochromatic light of wavelength λ ejects photoelectrons from a metal surface with work function (φ) 2.4 eV. These photoelectrons are made to collide with hydrogen atoms in ground state. The maximum value of λ for which hydrogen atom may be ionized is
[Take hc=1240 eV-nm]