The other way around! – as Mr Borek told you: Index (i) before Index (f).
Let's start:
deltaE = 2.187 * 10-18 * (1/1 – 1/64) = 2.144 * 10-18
my book says to use
-2.187 x 10-18 J (1/n
f2-1/n
i2) & you say to use 2.187 x 10-18 J (1/n
i2-1/n
f2) which are essentially the same equation.
deltaE = 2.187 * 10-18 * (1/1 – 1/64) = 2.144 * 10-18
i just got the same answer using my book's formula, i must have copied the answer wrong from the calculator. (10
-18 vs. 10
-8) wow i feel stupid.
I just got A) 92.7 nm, so i hope that's the right answer.
thanks for everyone's help