What is the value of n for the level in which the electron originated?

[plstevens]

An electron in a hydrogen atom relaxes to the n= 4 level, emitting light of 114THz.

 

[mysqlpress]

should be n=6
E=hf = (6.63*10^-34)(114*10^12) = 7.56*10^-20J = 0.472eV
E4= -13.6/4^2
En = -13.6/n^2
delta E =En-E4=0.85-13.6/n^2
deltaE = 0.472
you will find n=6

 

[plstevens]

Thank you so much, but i have one question:

when u did 114*10^12 was that showing the conversion factor from THz to Hz?

 

[plstevens]

also in the first step, how did u convert from J to eV? And where did delta E come from?

 

[mysqlpress]

1THz = 10^12 Hz
1eV =1.6*10^-19 J
(7,.56 *10^-20)/(1.6*10^-19) = ? eV