Plz Q no 33 GravlITy academy
ATOMIC STRUCITJRE
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3S
36.
Find the threshold wavelengths for photoelectric effect from a copper surface, a sodium
ard a cesium surface. The voork func*im of these metals are 4.5 eV, 2.3 eV and
hut,
Energy required to stop the ejection of electrons trom Cu plate s 0.24 eV, When radiati
253.7 nm strikes the plate Calculate the v.ork function.
KJ 'mote
Calculate the threshold frequency Ot metal if the binding energy is
Calculate the minimum & maximum kinetic energy in eV of photoelectrons produced
400 nm light. when the potential difference is 2V is applied as 'accelerating voltage
(maximum) wavelength far the photoelectric effect in cesium is 660 nm.
A stationary Het ion emitted a photon corresponding to a first line Of the Lyman se
photon liberated a photoelectron from a stationary H atom in ground state. What is the
photoelectron?
The minimum energy necessary to overcome the attractive force between the electro
surface Of silver metal is TS2 10-1B J. Wnat will be the maximum kinetic energy Of the
ejected from silver which is being irradiated With ultraviolet light having a wavelength 36
