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A 12.5eV electron beam is used to bombard gaseous hydrogen at room temperature What series of wavelengths will be emitted. |
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Answer» Solution :`E_(n)=(-13.6)/(2^(2))eV` Energy required to excite hydrogen atom from ground state to the second EXCITED state `E_("final")-E_("initial")` `=-1.51-(-13.6)=120.9eV` i.e., hydrogen atoms WOULD be excited UPTO third energy level (i.e., n = 3) second excited state, Alternatively  For Lyman `(1)/(lambda)=R[(1)/(n_(f)^(2))-(1)/(n_(i)^(2))]` or `, (1)/(lambda)=1.097xx10^(7)[(1)/(2^(2))-(1)/(3^(2))]` `rArr lamda=122nm` For Balmer `(1)/(lambda)=1.097xx10^(7)[(1)/(2^(2))-(1)/(3^(2))]` `lambda=656.3 nm` |
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