Spectroscopy Review

“And the reverberations of his momentous discovery echo still. His spectral lines revealed that the visible cosmos is all made of the same (a)   . The planets. The stars. The galaxies. We, ourselves, and all of life. The same star stuff.

He made it possible for us to know what's in the (b)   of other worlds. And in galaxies millions of light-years away.

Spectral lines revealed not only the composition of far-off objects, but also their (c)   towards or away from us. Using them, we discovered that our universe is (d)   .

• elements
• atmospheres
• motion
• expanding
• collapsing

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What is the “message written in the dark vertical lines” seen in light coming from stars? What do the dark lines reveal to us?  What are three things we can learn from spectral lines?

• The motion of objects. (Redshift vs. Blueshift)

• The temperature of objects.

• The composition of objects (what they are made of).

• The age of objects (nearly exact ages for when every object formed).

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______________ is the energy that can travel through empty space in the form of waves. 

• telescopes
• electromagnetic spectrum
• observatory
• Sound waves

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Reorder the following parts of the electromagnetic spectrum from longest wavelength to shortest wavelength.

• Ultraviolet

• Microwave

• Red Visible

• Blue Visible

• Infrared

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Which of the following type of electromagnetic radiation has the most energy

• infrared
• ultraviolet
• microwaves
• radiowaves

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Emission of light from an atom occurs when an electron

• drops from a higher to a lower energy level.
•    jumps from a lower to a higher energy level.   
•    moves within its atomic orbital.
• falls into the nucleus.

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Why are line emission spectra of elements called "atomic fingerprints"?

• They are all the same
• They are all unique
• They are all similar
• They all contain colored light

Answer explanation

Every element has a unique spectrum. That is why we can tell what stars are made from (even though they are located light years away from us).

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Each element on the periodic table can be identified by its

• classification as a solid, liquid or gas.

• location on the table.

• ability to react to form compounds.

• unique spectral "fingerprint."

Answer explanation

Every element has a unique "fingerprint"!

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What is the unknown spectra?

• beryllium
• copper
• manganese
• strontium

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Which elements are in the unknown sample?

• A and B
• B and C
• A and D
• B and D

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