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**1. The problem statement, all variables and given/known data**

A ruby laser emits light of wavelength 694.3 nm. If this light is due to the transition from n=2 to n=1 state of the electron in a box, what is the width of the box?

**2. Relevant equations**

K=2pi/Lambda

kL=npi

**3. The attempt at a solution**

Thinkin about the problem, i have calculated K as shown in my formula to be 9049669 but when i use this k to find L then i end up with 694.3 again. I dont know if this is the answer or if this is a really big mistake???