Question

Kinetic energy of a photoelectric effect with stopping potential 1.5 v

Answer 1

(c) 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 λ0 of the metal.
 Einstein's photoelectric equation:
eV0=hcλ0-φ
Here, V0 = stopping potential
             λ0 = threshold wavelength
             h = Planck's constant
             φ = work-function of metal
It is clear from the above equation that stopping potential is related to the shortest wavelength (threshold wavelength).