Photons havings `3^(rd)` highest energy of this sample can be used to excited particular excited state of `LI^(+2)`, then

Options

A. Wavelenght of photon used for this transition is 121.5 nm
B. Final excitd state of `Li^(+2)` is 6
C. kinetic energy of electron in intaial excited state of `Li^(+2)` is 13.6 eV
D. All are correct

Answer

D

Explanation

`3^(rd)` highest energetic photons `rArr(13.6-3.4) eV=10.2 eV`, transition is `2 to 1`
`lambda=(hc)/(E)=(1240)/(10.2)nm` = `121.5nm`
For H atom = for `Li^(+2)` ion
`13.6xx1[1-(1)/(2^(2))] =13.6xx9[(1)/(3^(2))-(1)/(6^(2))]`
`therefore`for `Li^(+2)` ion tramsition is `3 to 6`
Initial excited state =3
Final excited state =6
K.E. of electron in initial excited state of `L^(+2)`= `13.6xx(3^(2))/(3^(2))`=`13.6 eV`