Light of the prominent mercury line 2357A ejects electrons from a metal surface, that have stopping potential of 2 6 - Chemistry - Atomic Structure

Question

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

Shobhit Mittal · Accepted Answer

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