When a photon of energy 4.25eV strike the surface

Question

When a photon of energy 4.25eV strike the surface of metal A,the ejected photoelectronshave maximum kinetic energy TA (means A to subscript of T) and debroglie wavelength LA(lamda A). The maximum kinetic energy of photoelectronsliberated from another metal B by photon of energy 4.70eV is TB where TB=(TA-1.50)eV. If the debroglie wavelength of these photoelectrons is LB=2LA (lamda(B)=2.lamda(A)),then A)The work function of A is 2.25eV.B)The work function of B is 4.20eVC)TA=2.00eV.D)TB=2.75 eVIt is MORE THAN ONE CORRECT OPTION TYPE QUESTION. I want a detailed solution of this PLEASE

jitender · Accepted Answer

Using formula, ¥=h/√(2mE)¥=wavelength h= plancs constantm=mass of eE=kinetic energy.Now ...TAKING RATIO ...and after cancelling same terms¥A/ ¥B=√Tb/taPutting ¥b=2¥a (given)1/2=√Tb/TaSquaring both sides.1/4= Tb/TaTa=4TbPut Tb=Ta-1.5 (given)Now Ta=2eV and Tb= 0.5Then From equationTa=Ep-☆a☆=work functionEp=energy of photon.☆a=2.25Simillarly☆b=4.2 from Tb=Ep-☆bSo a,b,C options are correct

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Naga sree harsha reddy , 7 Years ago

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Modern Physics> When a photon of energy 4.25eV strike the...

Naga sree harsha reddy , 7 Years ago

jitender

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