A light source, emitting three wavelengths 5000 Å, 6000 Å and 7000 Å , has a total power of 10⁻³ ~W and a beam diameter 2 10⁻³ ~m . The power density is distributed equally amongst the three wavelengths. The beam shines normally on a metall

Question

A light source, emitting three wavelengths 5000 Å, 6000 Å and 7000 Å , has a total power of 10⁻³ ~W and a beam diameter 2 10⁻³ ~m . The power density is distributed equally amongst the three wavelengths. The beam shines normally on a metallic surface of area on 10⁻⁴ ~m ^2 and having a work function of 1.9 eV . Assume that each photon liberates an electron, calculate the charge emitted per unit area in one second(mark

Quantrex Academy · Accepted Answer

Correct answer: 93.76

aligned & =1.9 eV & _ th =6526 Å aligned Only 5000 Å and 6000 Å will liberate electrons h , no of photons, n= 10⁻³ ₁ 3 h c + 10⁻³ ₂ 3 h c Charge emitted/Area = [ 4 n e d^2 ]

Correct answer

Step-by-step solution

More from Dual Nature of Matter