### Clarification on ENERGY LEVEL concept

Posted:

**Wed Oct 12, 2016 7:07 am**Hi,

I have noticed that from the book(page 7 in chapter 1), atomic spectra calculation done by Rydberg could be written using the formula: v(frequency)=R[1/n1^2-1/n2^2].

However, in the course reader, we have done the example on page 48 using a different formula:

Change of E=E(final)-E(initial)

E(n)= -hR/n^2

v=E/h

Both equation will give me the frequency correctly, but if the question asks for quantum level(denoted by n), the answer came out different.

What is the difference between these two formulas?

Are we able to use both ways to solve for frequency, and only use page 48 in course reader to solve for quantum level?

Is it kind of confusing?

Thanks,

I have noticed that from the book(page 7 in chapter 1), atomic spectra calculation done by Rydberg could be written using the formula: v(frequency)=R[1/n1^2-1/n2^2].

However, in the course reader, we have done the example on page 48 using a different formula:

Change of E=E(final)-E(initial)

E(n)= -hR/n^2

v=E/h

Both equation will give me the frequency correctly, but if the question asks for quantum level(denoted by n), the answer came out different.

What is the difference between these two formulas?

Are we able to use both ways to solve for frequency, and only use page 48 in course reader to solve for quantum level?

Is it kind of confusing?

Thanks,