Question

The energy required to remove electron from sodium is 2.3 eV. Does sodium show photoelectric effect for orange light of wavelength 6800 $\overset{\circ}{A}$ ?
(Ans: sodium does not show photoelectric effect)

Answer 1

2.3 ev is thus the Work Functiongiven for Na.

from photoelectric eqn.

E = W + K.E.

Determine the E for wavelength 6800 eV.

Therfore,

E = hv = 1240/680 = 1.82 eV

which is hence less than Work Function 2.3 eV.

Therefore nO photoelctic effect would happen

Answer 2

Hey Dear,

● Answer -

No, Sodium doesn't show photoelectric effect.

● Explaination -

Energy released by orange light is calculated by -

E = hc/λ

E = (6.63×10^-34 × 3×10^8) / (6800×10^-10)

E = 2.92×10^-19 J

E = 1.83 eV

As orange light can produce less energy that threshold energy of sodium, sodium wont show photoelectric effect.

Hope you understand .