If φ is the work function of a photosensitive material in eV and incident wavelength has numerical value λ = hc/e metre, find the maximum kinetic energy of emitted photoelectrons (SI units), where h is Planck’s constant and c is the speed of light.
Options

Question

If φ is the work function of a photosensitive material in eV and incident wavelength has numerical value λ = hc/e metre, find the maximum kinetic energy of emitted photoelectrons (SI units), where h is Planck’s constant and c is the speed of light.

Options

G1 Physics · Accepted Answer

The incident photon energy is E = hc/λ. With λ = hc/e, E = e joules, where e is the elementary charge magnitude. If the work function φ is in eV, its energy in joules is φe, so Kₘₐₓ = e(1 − φ) J. The original answer choices mix φ and e inconsistently; option C is the source key, but dimensional units require care.