Chapter 4-Chemical Dominoes
Section 5: Visible Light, Energy, and the Electromagnetic Spectrum
Post-Test
1) Which statement describes how an atom in the ground state becomes excited?
a. The atom absorbs energy, and one or more electrons move to a higher electron shell.
b. The atom absorbs energy, and one or more electrons move to a lower electron shell.
c. The atom releases energy, and one or more electrons move to a higher electron shell.
d. The atom releases energy, and one or more electrons move to a lower electron shell.
2) Which color in the visible spectrum has the lowest amount of energy?
a. Red
b. Yellow
c. Blue
d. Violet
3) Which of the following waves has the highest frequency?
1.
2.
3.
a.
b.
c.
d.
1
2
3
all have the same frequency
4) Examine the spectra below. The bottom spectrum is a mixture of two or more of the
elements above it. Which elements are present in the mixture?
a.
b.
c.
d.
Ca, Cd, and Li
Ca, Cd, and Na
Ca, Na, and Sr
Cd, Na, and Sr
5) In many communities, streetlights contain sodium vapor. When you look at the spectrum
of sodium through spectrum glasses, the only line you see is yellow. This is why these
streetlights appear yellow and not white.
= 570.0 nm

If the frequency of this yellow light is 5.55 x 1014 s-1, how much energy does it have?
E = hf and h = 6.63 x 10-34 J•s
a.
b.
c.
d.
3.68 x 10-47 J
3.68 x 10-19 J
3.68 x 1021 J
3.68 x 1049 J
Chapter 4-Chemical Dominoes
Section 5: Visible Light, Energy, and the Electromagnetic Spectrum
Post-Test Answer Key
1)
2)
3)
4)
5)
A
A
C
D
B