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

Since the value of hc = 1240 eV nm Energy corresponding to λ=300 nm is (1240 eV nm/300 nm)=4.134 eV Elements having φ < 4.134 eV will show photoelectric effect, are Li, Na, K, and Mg ⇒ <img class="img-fluid question-image" alt="image" src="https://cdn.tardigrade.in/img/question/chemistry/231a7b1feb110c8bf2c3565e945082cb-.png" /> So, number of metals showing photo electric effect will be four, i.e., Li, Na, K, and Mg.

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

Since the value of hc=1240eVnm Energy corresponding to λ=300nm is 300nm1240eVnm​=4.134eV Elements having ϕ<4.134eV will show photoelectric effect, are Li,Na,K, and Mg⇒ So, number of metals showing photo electric effect will be four, i.e., Li,Na,K, and Mg.

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

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