Absorption and Emission (7.1.2)

Question 1

• The color of light depends on the wavelengths of which it is composed and the observed color of an object is due to the wavelengths that were not absorbed by the object.

Answer 1

• The color of light depends on the wavelengths of which it is composed and the observed color of an object is due to the wavelengths that were not absorbed by the object.

Question 2

• An absorption spectrum is a plot of the intensity of light absorbed by a sample versus wavelength.

Answer 2

• An absorption spectrum is a plot of the intensity of light absorbed by a sample versus wavelength.

Question 3

• An emission spectrum is a plot of the intensity of light emitted by a source versus wavelength.

Answer 3

• An emission spectrum is a plot of the intensity of light emitted by a source versus wavelength.

Question 4

• Absorption and emission spectra are important tools for probing at the atomic level of a sample.

Answer 4

• Absorption and emission spectra are important tools for probing at the atomic level of a sample.

Question 5

The color of light depends on the wavelengths of
which it is composed and the observed color of an
object is due to the wavelengths that were not
absorbed by the object.
White light is composed of light with all wavelengths
present.
An absorption spectrum is a plot of the intensity of
light absorbed by a sample versus wavelength.
The absorption spectrum of a substance is obtained
by passing white light in a narrow beam through the
substance. The light emerging from the substance
is then passed through a prism. The prism
separates the wavelengths (colors) of light present
in the beam and allows a detector to measure the
intensity of the emerging light by wavelength.
In the example, the red sample absorbs the green
portion of the spectrum, which is absent at the point
of the detector.

Answer 5

The color of light depends on the wavelengths of
which it is composed and the observed color of an
object is due to the wavelengths that were not
absorbed by the object.
White light is composed of light with all wavelengths
present.
An absorption spectrum is a plot of the intensity of
light absorbed by a sample versus wavelength.
The absorption spectrum of a substance is obtained
by passing white light in a narrow beam through the
substance. The light emerging from the substance
is then passed through a prism. The prism
separates the wavelengths (colors) of light present
in the beam and allows a detector to measure the
intensity of the emerging light by wavelength.
In the example, the red sample absorbs the green
portion of the spectrum, which is absent at the point
of the detector.

Question 6

An emission spectrum is a plot of the intensity of
light emitted by a source versus wavelength.
In an emission spectrum the source and the sample
are the same. The emission spectrum is obtained
by passing the light emitted by a substance in a
narrow beam through a prism. The prism separates
the wavelengths of the light present in the beam and
allows a detector to measure the intensity of the
light by wavelength.
Absorption and emission spectra are important tools
for probing at the atomic level of a sample.
Different elements have different emission spectra.
This can be used to identify the components of a
sample.
In the example, the emission spectra produced by
exciting the elements hydrogen and neon show
characteristic bands. The absorption spectra of
these two colorless gases are similar.
The discrete wavelengths emitted by the hydrogen
and neon gas give information about energy levels
in the atoms.

Answer 6

An emission spectrum is a plot of the intensity of
light emitted by a source versus wavelength.
In an emission spectrum the source and the sample
are the same. The emission spectrum is obtained
by passing the light emitted by a substance in a
narrow beam through a prism. The prism separates
the wavelengths of the light present in the beam and
allows a detector to measure the intensity of the
light by wavelength.
Absorption and emission spectra are important tools
for probing at the atomic level of a sample.
Different elements have different emission spectra.
This can be used to identify the components of a
sample.
In the example, the emission spectra produced by
exciting the elements hydrogen and neon show
characteristic bands. The absorption spectra of
these two colorless gases are similar.
The discrete wavelengths emitted by the hydrogen
and neon gas give information about energy levels
in the atoms.