Question

Question 2.53 The ejection of the photoelectron from the silver metal in the photoelectric effect experiment can be stopped by applying the voltage of 0.35 V when the radiation 256.7 nm is used. Calculate the work function for silver metal.

Class XI Structure of Atom Page 68

Answer 1

we know,
E = hc/λ
here, h = 6.626 × 10^-34 Js
c = 3 × 10^8 m/s
λ = 256.7 nm = 2.567 × 10^-7 m

E = 6.626 × 10^-34 Js × 3 × 10^8 m/s/2.567 × 10^-7 m
= 7.74 × 10^-19 J/1.602 × 10^-19 J/eV
= 4.83 eV
E = 4.83 eV

now, potential gives the kinetic energy to electron.
$eV_0=\frac{1}{2}mv_{max}^2=K.E$
K.E = e × 0.35V = 0.35 eV

so, work function = Energy - K.E
= 4.83 eV - 0.35 eV
= 4.48 eV

Answer 2

Answer:

Explanation:hey mate here is ur answer