Question

Threshold wave length of sodium element is 6800 angsgrong What will be it's work function

Answer 1

≡QUESTION≡

If the threshold wave length of Na element is 6800 A°, find its work function .

                                                                                       

║⊕ANSWER⊕║

Given

λ = 6800 A° = 6800×10⁻¹⁰ m

Work function of sodium is calculated by -

Φ = hc/λ

In electron volts,

Φ = hc/eλ

Φ = (6.63×10⁻³⁴ × 3×10⁸) / (1.6×10⁻¹⁹ × 6800×10⁻¹⁰)

Φ = 1.828 eV

Therefore, work function of Na is 1.828 eV.