Which lines are in the inferred range from the transitions of electrons in hydrogen atoms?
a. ni=4 to nf=2
b. ni=5 to nf=2
c. ni=5 to nf=3
d. ni=4 to nf=3
e. ni=3 to nf=2
f. ni=6 to nf=2
g. ni=3 to nf=1
h. ni=7 to nf=2
i. ni=2 to nf=1