Hydrogen Spectrum — Practice Quiz

Question 1

Wavelength of Hβ (n=4 → n=2) in hydrogen:

Accepted Answer

486 nm

Answer

656 nm

Answer

121 nm

Answer

364 nm

Question 2

Series limit of Lyman series:

Accepted Answer

91.2 nm

Answer

121 nm

Answer

656 nm

Answer

365 nm

Question 3

Which hydrogen line is in the VISIBLE region?

Accepted Answer

Balmer-α (656 nm)

Answer

Lyman-α (121 nm)

Answer

Paschen-α (1875 nm)

Answer

21-cm line

Question 4

Number of distinct lines from n=5 to lower levels (hydrogen):

Accepted Answer

10

Answer

4

Answer

5

Answer

20

Question 5

The 21-cm line of hydrogen corresponds to:

Accepted Answer

Hyperfine transition in the ground state

Answer

Lyman series

Answer

Balmer series

Answer

Ionisation