Question

A metal whose work function is 3.31 ev is emulated by the light of wavelength 3 into 10 to the power minus 7 m what is the threshold frequency of photoelectric emission take.

Answer 1

work function = h× threshold frequency(ν₀)

3.31eV = 6.626 × 10⁻³⁴ J.sec × threshold frequency(ν₀)

we know that one eV = 1.602 × 10⁻¹⁹

3.31 × 1.602 × 10⁻¹⁹ = 6.626 × 10⁻³⁴ J.sec × threshold frequency(ν₀)

threshold frequency(ν₀) = 5 × 10¹⁴ s⁻¹