Question

Match the following.
B.E-Binding energy
I.E- Ionization energy

Answer 1

(A) B.E of $H{e}^{+}atom=\frac{13.6\times 2^2}{n^2}$ n=1,2,3....

Hence it can be 13.6 eV, 3.4 eV both(B) in $7\to 3$ transition $\Delta$ n =7-3=4

$\therefore$ maximum number of spectral lined observed =$\frac{4(4+1)}{2}=10$

It is line of paschen series hence infrared region

(c) $5\to 1$ =10 lines, out of these transition $5\to 4$,$5\to 3$,$4\to 3$ transition will be in infrared region and $2\to 1$ will be U.V region.

(D) Series limit of Blamer series is the last line having 3.4 eV energy.