The work function (φ) of some metals is listed below. The number of metals which will show photoelectric effect when light of 300 nm wavelength falls on the metal is Metal Li Na K Mg Cu Ag Fe pt W φ (eV) 2.4 2.3 2.2 3.7 4.8 4.3 4.7 6.3 4.75

Question

The work function (φ) of some metals is listed below. The number of metals which will show photoelectric effect when light of 300 nm wavelength falls on the metal is Metal Li Na K Mg Cu Ag Fe pt W φ (eV) 2.4 2.3 2.2 3.7 4.8 4.3 4.7 6.3 4.75 (A)  (B)  (C)  (D)

Tardigrade Admin · Accepted Answer

Energy of photon (h c/λ) J=(h c/e λ) e V=(6.625 × 10-34 × 3 × 108/300 × 10-9 × 1.602 × 10-19) For photoelectric effect to occur, energy of incia must be greater than work function of metal. Hence Na , K and Mg have work functions less than 4.14

Q. The work function (ϕ) of some metals is listed below. The number of metals which will show photoelectric effect when light of 300nm wavelength falls on the metal is Metal Li Na K Mg Cu Ag Fe pt W ϕ (eV) 2.4 2.3 2.2 3.7 4.8 4.3 4.7 6.3 4.75

Energy of photon λhc​J=eλhc​eV=300×10−9×1.602×10−196.625×10−34×3×108​ For photoelectric effect to occur, energy of incia must be greater than work function of metal. Hence Na,K and Mg have work functions less than 4.14

Q. The work function $(ϕ)$ of some metals is listed below. The number of metals which will show photoelectric effect when
light of $300 nm$ wavelength falls on the metal is

Metal Li Na K Mg Cu Ag Fe pt W

$ϕ$ (eV) 2.4 2.3 2.2 3.7 4.8 4.3 4.7 6.3 4.75