Light of the prominent mercury line 2357A ejects electrons from a metal surface, that have stopping potential of 2.6 volts. The stopping potential of electrons ejected from the same metal by the other prominent mercury line 1849A is 4.04 volts. a) Calculate the value of Planck s constant b) Calculate the value of threshold frequency using these data

Dear Student,

let the work function be φ of the metal λ=2357 angstrom , λ'=1849 angstrom .2.6eV=hcλe-φ4.04eV=hcλ'e-φsolve the above eqn for h and get the value of h by eliminating φ.Regards

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