## Principal Energy Level Change Sig Figs

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

Lily Guo 1D
Posts: 64
Joined: Fri Sep 29, 2017 7:03 am

### Principal Energy Level Change Sig Figs

When you're calculating the frequency emitted from a jump in principal energy levels (i.e. n=1 to n=3), how would you determine the significant figures needed for the answer?

Lianna Kishi 1A
Posts: 23
Joined: Thu Jul 27, 2017 3:00 am

### Re: Principal Energy Level Change Sig Figs

I was wondering the same thing, but on past tests I just made sure to put around 3 or 4 numbers after the decimal and I didn't get marked off. Hope this helps!

SitharaMenon2B
Posts: 50
Joined: Thu Jul 27, 2017 3:01 am

### Re: Principal Energy Level Change Sig Figs

I think you can use the lowest number of sig figs that the constants are given in. For example, Planck's constant and Rydberg's constant are both given with 6 sig figs, so I think you would use 6 sig figs in your answer.