JEE Advanced 2014 Physics question
A metal surface is illuminated by light of two different wavelengths 248 nm and 310 nm. The maximum speeds of the photoelectrons corresponding to these wavelengths are and , respectively. If the ratio and hc = 1240 eV nm, the work function of the metal is nearly
Answer: (A)
Solution
Photon energies: eV and eV. Kinetic energies are in the ratio $
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