Section: Science

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Based on the passage and Table 1, the work function of the metal used in the photocell was:

1. 2.0 eV
2. 3.1 eV
3. 4.9 eV
4. 6.0 eV

According to the passage, the maximum kinetic energy an ejected electron can have is the photon's energy minus the metal's work function. In Trials 4–6, the energy per photon was 4.0 eV and the maximum kinetic energy of the electrons ejected from the metal was 0.9. In Trials 7–9, the energy per photon was 6.0 eV and the maximum kinetic energy of the electrons ejected from the metal was 2.9. Thus, the work function was 3.1 eV.