The photolectric effect describes th phenomnon that when light of a certain frequency strikes a metal surface, electrons are ejected. Explain what happens to the electrons from the perspective of energy levels . Draw a diagram that depicts what happens when the light is absorbed by the metal. use this diagram to explain why ther is a "threshold frquency" below which no ejcted electrons are observed.

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anonymous · Answer

electrons with their given energy levels can be ejected by light only and only if incoming light has enoguh energy to beat their threshold energy, if incoming light doesnt carry enough energy electrons would'nt be ejected (maybe excited but not ejected) which is shown neatly in this diagram: http://hyperphysics.phy-astr.gsu.edu/hbase/imgmod2/pelec.gif each metal has its own threshold frequency depending on its electron configuration, as each element has different number of electrons in its shells. here are some pictures that might clear that up: http://mmm.berklix.net/backup/the-phoney-photon.com/www.the-phoney-photon.com/Copy%20of%20New%20simplified%20HP%20%2029%20%20May_files/image006.jpg http://whs.wsd.wednet.edu/faculty/busse/mathhomepage/busseclasses/apphysics/studyguides/modernphysics/graphics/Fig-28-09.gif

yash2651995 · Answer

why ther is a "threshold frquency" below which no ejcted electrons are observed.?
bcuz electron on being excited mover to higher energy level.. if given energy inst enough to break hold of neutrons attractive force electron returns back and isnt ejected

anonymous · Answer

good job