## Rydberg Equation

H-Atom ($E_{n}=-\frac{hR}{n^{2}}$)

VictoriaRoderick_3A
Posts: 42
Joined: Fri Sep 25, 2015 3:00 am

### Rydberg Equation

For chapter 1 question 57, why is it (1/2^2) - 1(7^2) in the Rydberg equation? Since the two is the first number in the Balmer Series, does the sequence start at 2? The question is trying to solve for the fifth line in the sequence, so would it go N1=2 and then N2=3,4,5,6,7 with 7 being the fifth number? That is the only way I can see it working.

Kanwaldeep Rai 2H
Posts: 21
Joined: Fri Sep 25, 2015 3:00 am

### Re: Rydberg Equation

This is correct. The Balmer Series begins with n1=2 so all the wavelengths that are listed are from n2=3,4,5,6. The next line would be n2=7. You would first find the frequency of this line. V(frequency)= R(1/n1^2-1/n2^2)=
(3.29x10^15 Hz)(1/2^2-1/7^2)= 7.55x10^14 Hz
Then convert this to wavelength by using the equation: wavelength=speed of light/frequency.