The stopping potential for electrons ejected by 6.8 × 1014 Hz electromagnetic radiation incident on a certain sample is 1.8 V. The kinetic energy of the most energetic electrons ejected and the work function of the sample, respectively, are: 1.8 eV, 2.8 eV 1.8 eV, 1.0 eV 1.8 eV, 4.6 eV 2.8 eV, 1.0 eV 1.0 eV, 4.6 eV