Experiment 5: Emission Spectra & Electronic Structure Of Atoms

Question 1

What series is in the ultraviolet region of the energy diagram?

Answer 1

Lyman — nl = 1

Question 2

What series is in the visible region of the energy diagram?

Answer 2

Balmer — nl = 2

Question 3

What series is in the infrared region of the energy diagram

Answer 3

Paschen (nl = 3), brackett (nl = 4), pfund (nl = 5)

Question 4

Energy level diagram

Answer 4

Photons of light are emitted when the atom goes from a higher energy state characterized by nh to a lower energy state characterized by nl

Question 5

Percent relative error

Answer 5

% error = (measured true value - true value)/true value x 100

Question 6

Differences between fluorescent and incandescent lamps

Answer 6

• fluorescent lamp by observation looks to have cooler colours and incandescent lamp has warmer colours
• fluorescent had higher scale positions for green, blue, purple than incandescent
• incandescent had higher scale positions for red and yellow than fluorescent

Question 7

Absorption vs emission

Answer 7

Absorption (increasing n), emission (decreasing n)