spectroscopy emission lines, absorption lines, atomic excitation

Spectroscopy

Emission Lines, Absorption Lines, Atomic Excitation

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Emission Line, without any doppler effect






Emission Line, with doppler effect, blue shifted. Two objects are moving apart at great speed.






Emission Line, with doppler effect, red shifted. Two objects are moving together at great speed.

Emission and absorption lines are exact opposites.



Emission Lines are the fingerprint of an element.



Chapter Reivew

Self-Test: True or False?

1. Emission spectra are characterized by narrow bright lines of different colors __________

2. Imagine an emission spectrum produced by a container of hydrogen gas. Changing the amount of hydrogen in the container will change the colors of the lines in the spectrum ____________

3. In the previous question, changing the gas in the container from hydrogen to helium will change the colors of the lines occurringin the spectrum ________________

4. An absorption spectrum appears as a continuous spectrum interrupted by aseries of dark lines _______

5. The wavelengths of the emission lines produced by an element are different from the wavelengths of the absorption lines produced by the same element ____________

9. The ground state of an atom is that in which the electron is in its lowest energy level (orbital) _______

10. An electron can have any energy level within an atom so lang as it is above the ground state _______

11. An atom can remain in an excited state indefintely ______________

14. More than one element or molecule can have the same emission or absorption spectrum _________

Chapter Reivew

Self-Test: True or False?

1. Emission spectra are characterized by narrow bright lines of different colors TRUE

2. Imagine an emission spectrum produced by a container of hydrogen gas. Changing the amount of hydrogen in the container will change the colors of the lines in the spectrum FALSE

3. In the previous question, changing the gas in the container from hydrogen to helium will change the colors of the lines occurringin the spectrum TRUE

4. An absorption spectrum appears as a continuous spectrum interrupted by a series of dark lines TRUE

5. The wavelengths of the emission lines produced by an element are different from the wavelengths of the absorption lines produced by the same element FALSE

9. The ground state of an atom is that in which the electron is in its lowest energy level (orbital) TRUE

10. An electron can have any energy level within an atom so long as it is above the ground state FALSE

11. An atom can remain in an excited state indefintely FALSE

14. More than one element or molecule can have the same emission or absorption spectrum FALSE

Chapter Reivew

Self-Test: Fill in the Blank

2. Blackbody radiation is an example of a ___________________ spectrum.

6. Light behaves as both a _________________ and a ______________________.

8. Protons carry a ______________; electrons carry a _______________ charge.

9. When one or more electrons are stripped from the atom, the atom is said to be _______________.

10. An electron moves to a higher energy level in an atom after it _________ a photon of a specific energy.

11. When an electron moves to a lower energy level in an atom, it ________________ a photon of a specific energy.

Review and Discuss

Why are gamma rays generally harmful to life forms, but radio waves are harmless?

Chapter Reivew

Self-Test: Fill in the Blank

2. Blackbody radiation is an example of a CONTINUOUS spectrum.

6. Light behaves as both a WAVE and a PARTICLE.

8. Protons carry a POSITIVE; electrons carry a NEGATIVEcharge.

9. When one or more electrons are stripped from the atom, the atom is said to be CHARGED.

10. An electron moves to a higher energy level in an atom after it LOSES a photon of a specific energy.

11. When an electron moves to a lower energy level in an atom, it EMITS a photon of a specific energy.

Review and Discuss

Why are gamma rays generally harmful to life forms, but radio waves are harmless?

GAMMA RAYS HAVE MUCH HIGHER ENERGY LEVELS, MUCH SHORTER WAVELENGTHS. THEY CAN, IN FACT, CHANGE THE MOLECULAR STRUCTURE INSIDE THE DNA OF A PERSON. THIS MAY LEAD TO CANCER.

FEW PEOPLE KNOW THAT THE HIGH ENERGY LEVEL OF JUST UV, CAN DO THAT ALSO. THE ONLY MEMBER OF THE BAYWATCH TELEVISION SERIES, NOT TO GET SOME SKIN CANCER, WAS "THE HOFF".

spectroscopy emission lines, absorption lines, atomic excitation

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