Four metal surfaces E, F, G and H have work functions 1.5 eV, 3.0 eV, 4.0 eV and 4.3…
PHYSICS · Single correct · A Level · Physics · Particles and radiation · Particles and radiation
Problem
Four metal surfaces E, F, G and H have work functions 1.5 eV, 3.0 eV, 4.0 eV and 4.3 eV respectively. Each surface is first illuminated with light of photon energy 4.5 eV and then with light of photon energy 6.0 eV (intensities are the same in both cases). For every surface the two stopping potentials obtained are V1 (for 4.5 eV) and V2 (for 6.0 eV). Arrange the surfaces in descending order of the ratio V2/V1.
(a) G > H > F > E
(b) H > F > G > E
(c) H > G > F > E
(d) E > F > G > H