Thank you for the opportunity to help you with your question!

we know,

E = RE ( 1/ n1^2 - 1/n2 ^2)

here n1 = 3

and n2 = 8

and RE is the Rydberg constant = 1.0974 x 10^7 ( 1/9 - 1/64)

so, E = 1.0974 X10 ^7 x 0.0955

E = 1.04 x 10^6

Please let me know if you need any clarification for the doubts. I'm always happy to answer your questions. Looking forward to help you again. thank you. :)