In short, the smaller the work function the lower the threshold frequency. The work function of a metal surface is 4 ev. A photon of energy 2.5 ev and wavelength ′ λ ′ falls on a metal surface and the ejected electrons have maximum velocity ′ v ′.if the ′ λ ′ of the incident light is decreased by 20%, the maximum velocity of the emitted electrons is doubled.
For Photoelectric Effect To Occur, The Energy Of The Photon Must Be Greater Than The Work Function.
Photoelectric work function of metal is 3.2 ev. Light of wavelength falls on a metal having work hc photoelectric effect will take place only if function (a) a 21o (b) a 2 220 (c) 1 <ho (d) a = 420 %3d. Incident on a metal whose workfunction is 2.30 ev.
In Class, We Discussed How To Determine What That Work Function Was In Terms Of The Wavelength Of The Light, And Found That Light Of 450.
Go through again with a calculator and keep a close eye on significant figures. Light of wavelength λ falls on a metal having work function hc / λ0. Below, frequency f o or below energy hf o [ h is planck constant ] there will be no kinetic energy i.e.
B) Calculate The Maximum Wavelength Of Light For Which Photoemission Occurs For Light.
The longest wavelength of light that can cause photoelectron emission from this surfac. Now divide the work function (in joule) by the energy of photon you will get the no. When an electron is ejected from a metal surface it will have kinetic energy.
So, Hc Λ O = Work Function = W O Hc Λ O = 4.
The attempt at a solution. Hf o is known and defined as work function φ. The stopping potential is 2.54 v.