For balmer series in the spectrum of atomic hydrogen the wave number of each line is given by `bar(V) = R[(1)/(n_(1)^(2))-(1)/(n_(2)^(2))]` where `R_(H)` is a constant and `n_(1)` and `n_(2)` are integers. Which of the following statements (s), is (are correct)
1. As wave length decreases the lines in the series converge
2. The integer `n_(1)` is equal to 2.
3. The ionisation energy of hydrogen can be calculated from the wave numbers of three lines.
4. The line of shortest wavelength corresponds to = 3.

Options

A. 1, 2 and 3
B. 2, 3 and 4
C. 1, 2 and 4
D. 2 and 4 only

Answer

C

Explanation

(1) is correct because as wave length decreases, the spacing between the lines `(Delta lambda)` becomes smaller and smaller
(2) is correct because for Balmer series `n_(1) = 2`
(4) is correct because `n_(2) = 3` to `n_(1) = 2` will produce the longest wave length (being 1st line)