Physics · 2020
JEE Main · 5 September 2020, Shift 2 · Q25
The surface of a metal is illuminated alternately with photons of energies E_1=4 eV and E_2=2.5 eV respectively. The ratio of maximum speeds of the…
The surface of a metal is illuminated alternately with photons of energies $\displaystyle \mathrm{E}_1=4 \mathrm{eV}$ and $\displaystyle \mathrm{E}_2=2.5 \mathrm{eV}$ respectively. The ratio of maximum speeds of the photoelectrons emitted in the two cases is 2. The work function of the metal in (eV) is \_\_\_\_.
Official answer
2
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