In a hydrogen atom , in transition of electron a photon of energy 2.55 eV is emitted , then the change in wavelenghtof the eletron is

In a hydrogen atom , in transition of electron a photon of energy 2.55

1.	In a hydrogen atom , in transition of electron a photon of energy 2.55 eV is emitted , then the change in wavelenghtof the eletron is
Answer» `3.32Å` `6.64Å` `9.97Å` NONE of these SOLUTION :`2pir_(n)=nlambda` `4 to 2` `lambda_(4)=(2pir_(4))/(4)""lambda_(2)=(2pir_(2))/(2)` `lambda_(4)lambda_(2P)=2pi[(0.529(4)^(2))/(1xx4)-(0.529(2)^(2))/(2)]` =`2pi(0.529)(2)` `=4pir_(1)`=`6.64 Å`