Atomic Spectrum

Question 1

Spectrum

Answer 1

Combination of multiple frequencies arranged in increasing or decreasing order

Question 2

Different types of Spectrum

Answer 2

1) Continuous (radiation merging into each other)
2) Discontinuous (radiations distinguishable from each other)
3) Line (Emitted by excited atom, contains only specific wavelengths)
4) Band
5) Emission (Given out by object that absorbed energy)
6) Absorption

Question 3

Atomic Spectrum Of Hydrogen

Answer 3

• Formed when H2 gas subjected to electric discharge

Question 4

Hydrogen Spectrum Properties

Answer 4

• Have fixed wave number
• Wave no. of lines in visible series (Balmer Series) expressed as,

109,677 X ((1/2^2) - (1/n^2)) cm^-1

• Wave no. formula :-
  109677 ( (1/n1^2) - (1/n2^2))

109677 = Rydberg Constant

Question 5

Spectral Lines ( Series )

Answer 5

Series :-
1) Lyman :-
n1 = 1
n2 = 2, 3, ….
Spectral Region - Ultraviolet
2) Balmer :-
n1 = 2
n2 = 3, 4, ….
Spectral Region - Visible
3) Paschen :-
n1 = 3
n2 = 4, 5, ….
Spectral Region - Infrared
4) Brackett :-
n1 = 4
n2 = 5, 6, ….
Spectral Region - Infrared
5) Pfund :-
n1 = 5
n2 = 6, 7, ….
Spectral Region - Infrared