The maximum energy is 6.2 eV.
Photoelectric effect: Some electrons are released from the metal surface when photons strike it. The photoelectric effect is the name given to this occurrence.
The work function (φ) of a metal is the minimal amount of energy required to remove electrons from its surface.
Maximum kinetic energy is the most energy that electrons have when they are expelled off a metal surface (KEmax).
The work function of sodium is 2.1 eV.
The wavelength of the radiation is 150 nm.
Work function, φ = 2.1 eV
Wavelength, λ = 150 nm = 150 × 10⁻⁹ = 15 × 10⁻⁸ m
Einstein's photoelectric equation is given as:
E = φ + KE(max)
KE(max) = E - φ
KE(max) = ( hc / λ ) - φ
KE(max) = ( 6.63 × 10⁻³⁴) × 3 × 10⁸ / (15 × 10⁻⁸ × 1.6 × 10⁻¹⁹) - 2.1
KE(max) = 0.8287 × 10 - 2.1
KE(max) = 8.3 eV - 2.1 eV
KE(max) = 6.2 eV
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