Dual Nature Of Radiation And Matter Flashcards
Who proved that l8ght have dual nature and on basis of which theory ?
Einstein on basis of planks quantum theory
Methods of removing electron from the metal surfaces are
Thermoionic ,feild emissions, secondary emissions, photoelectric emissions
Work function =
1.Unit
Best photosensitive material
ev
Cesium
Photoelectric effect Discovered by
Heinrich hertz
Variation of photoelectric effect with 1intensity and 2current and 3 distance
Directly
Directly
Inversely square
Saturation current
When all photoelectrons are emmited and collected by A plare then current value maxi is such value called saturation current
Current relation with Vapplied
Directly
Stopping potential that is minimum and negative potential given that stops current is given to whom
A plate
Stopping potential varies with frequency by
Directly
Saturation current value when intensity is constant
Equal for all frequencies
What is threshold frequency
Minimum frequency for which the emissions of photoelectroh emissions starts is called as threshold frequency
Relation bet frequency and stopping potential
Directly
Einstein photoelectric equation is
h×frequency -work function =KEmax
Energy given by plank on metal surface is used by method
Part of energy as work function and part to give velocity max equal to KE max
Einstein photoelectric equation is based on
Energy conservation