[" The threshold wavelength for "],[" sodium is "680nm" .The "],[" photoelectric workfunction "],[" in "eV" is "(h=6.62times10^(-34)Js,1],[eV=1.6times10^(-19)J,c=30times10^(8)m],[s^(-1))]

Frequency of photon having 100 eV energy is ……Hz [ h=6.62xx10^(-34)Js,1eV=1.6xx10^(-19)Js]

In photoelectric effect threshold wavelength of sodium is 5000Å .Find its work function. [ h=6.6xx10^(-34)Js,c=3xx10^(8)m//s,1eV=1.6xx10^(-19)Js]

The photoelectric threshold wavelength for Potassium having work function of 2eV is.......... (Take h= 6.6 xx 10^(-34) J s. 1 eV = 1.6 xx 10^(-19) J , C = 3 xx 10^8 Ms^(-1) )

A metal has a thresold wavelength of 6000 overset@A Calculte:Thresold frequency Calculate Work function of metal (given: h=6.62 xx 10^(-34)Js,e =1.6 xx 10^(-19)C)

The wavelength of most energetic X-rays emitted when a metal target is bombarded by 40 keV electrons, is approximately (h=6.62xx10^(-34)J-sec,1eV=1.6xx10^(-19)J,c=3xx10^(8)m//s) .

The work function of potassium is 2.0 eV. When it is illuminated by light of wavelength 3300A^(@) photo electrons are emitted. The stopping potential of photo electrons is [Plank’s constant h=6.6 xx 10^(-34)Js,1eV=1.6 xx 10^(-19)J,C=3 xx 10^(8)ms^(-1) ]