Multiple choice

The first emission line in the atomic spectrum of hydrogen in the balmer series appears at ?

  1. (5 / 36) R cm-1 .

  2. (8 / 9) R cm-1 .

  3. ( 3 / 16 ) R cm-1 .

  4. ( 21 / 100 ) R cm-1 .
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This option is incorrect because wave number is given by ; ϋ = RZ2 [ 1 / n12 - 1 / n22 ]   . here , n1 = 2   , n2 = 3  &  Z = 1  . ϋ = R [ 1 / 4 - 1 / 9 ] = (5 / 36 ) R cm-1 . hence, this option is correct .      

Keep practicing — related questions