Answer 1

is related to the shortest wavelength

For photoelectric effect to be observed, wavelength of the incident light `(λ)` should be less than the threshold wavelength `(λ_0)` of the metal .

Einstein's photoelectric equation :

`eV_0 = (hc)/(λ_0) - varphi`

Here, V₀ = stopping potential

`λ_0` = threshold wavelength

h = Planck's constant

`varphi` = work-function of metal
It is clear from the above equation that stopping potential is related to the shortest wavelength (threshold wavelength).