Solving a H Atom Energy Problem: Am I Being an Idiot?

[Johnny010]

I am having a problem with this question in a past exam paper...I may just be being a bit of an idiot:

Show that if an H atom is in its ground state the minimum energy photon it can
absorb is 1.634_x10^-18 J.

I am using The formula:

E_n2-E_n1=hcR∞(1/n₁² - 1/n²₂)

I keep getting a different value using n1 as 0 and n2 as 1...also using 1 and 2 respectively.
What am I doing incorrectly?

 

[Doc Al]

The ground state is n = 1 (not n = 0).

 

[Johnny010]

Sorry...I was forgetting to do 1/4 for the final term...It has been a long day.

 

[Johnny010]

Where is the solved button?

 

[tiny-tim]

Where is the solved button?

It dissolved.