Question

1. What is the binding energy of an electron that requires a photon with a maximum wavelength of 430 nm to eject it?

1. If a photon with a frequency of 8.21 x 10¹⁵ Hz is used, what is the kinetic energy of the electron?

Answer 1

Work function (Wo) Cow Jonization Cuey 84; "The Qualet 0) energy requiycol to efect au llofray from Surface of metal is called work function Or binding Emergy. binaing energy (wo) = hoo Snc Here Threshold trequency vo= to = n= Threshold wavelaugth plauis constant c= speed of light. soi (Threshold wavelength) : manimum wavelength of incident light which can eject election from surface of metal. Given, to = 430 mm = 430x10 m.

= binding Energy (Wo) = = 6.62x160m3.sgk x 3 vote poi 430x108m -26 9 - loc Joule 19.867 10 x 10 - 430 = 0.0461 x lo' Joule 4.61 x 1895 - Binding Suergy = 4.61* 1695 is Frequency of Incident light (20)=8-21 X10 Hz, k.Eot Election = ? ho= work E (puoto electric effect equctius, » RE ct electron = n2 - Wo = 6622655-5fx 8-21460%set - - 4.61x10 a = 189 ( 54.35 – 4.61) Joule -19 = 49.24x109 soule. -19 Joule =) KiE of electron = 49.24 x 10