Calculating 5 Longest Lyman Series Wavelengths

[Tony11235]

How am supposed to calculate the five longest wavelengths of the Lyman series? What values of n are used? I see how you arrive at a definite limit as n goes to infinity, but the five longest? Sort of a dumb question.

 

[phucnv87]

Remember that

$$\Delta E=\frac{hc}{\lambda}$$

$$\Longrightarrow \lambda=\frac{hc}{\Delta E}$$

$$\Delta E=E_{initial}-E_{final}$$

To get the longest wavelength, $$\Delta E$$ must be at minimum value[/color]