- Why didn t Balmer see the line for the n=6 to n=1 transition appear in the spectrum for hydrogen?

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Discover Questions

Evaluate: lim x → 0 (sin(x) - x) / (x^3). I got -1/6, is this right? How do i prove the following:
Arctanx - Arctany <= /x-y/? Solve the inequality 8x-16-x^2<0? How to find polynomial expression given the roots: -2+sqrt (7 , -2-sqrt(7 Sqrt=Square root? What is the orbital location of the 9th planet now?

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