Transition energy estimation based on bond length

[hanhjung99]

I come across this question in a textbook. Somehow my result is way off from the solution answer. I used the energy formula for particle in a box with n(Initial) = 22 and n(End) = 23, the calculated box length is 732 pm. I arrived at an answer of 39.3 nm. The answer from the answer book is but 239 nm. Thanks for the help

 

[anorlunda]

Our rules say that you must show us your work, not just your answer, before our helpers give help.

 

[hanhjung99]

Our rules say that you must show us your work, not just your answer, before our helpers give help.

 

[anorlunda]

You're making it hard for would be helpers. Can you rotate that image 90 degrees, crop,it and enhance the contrast?

We are volunteers here. If a helper thinks your post is difficult, he/she can just skip,it.

 

[hanhjung99]

Edited image