© 2010 pearson education, inc. range of visible light our eyes can see from 400 (blue/purple) to...

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© 2010 Pearson Education, Inc. Range of Visible Light • Our eyes can see from 400 (blue/purple) to 700 (red) nm. • Nm = nanometers = 10 -9 meters • Our eyes are most sensitive to yellow/green since that is the color of our sun

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Page 1: © 2010 Pearson Education, Inc. Range of Visible Light Our eyes can see from 400 (blue/purple) to 700 (red) nm. Nm = nanometers = 10 -9 meters Our eyes

© 2010 Pearson Education, Inc.

Range of Visible Light

• Our eyes can see from 400 (blue/purple) to 700 (red) nm.

• Nm = nanometers = 10-9 meters

• Our eyes are most sensitive to yellow/green since that is the color of our sun

Page 2: © 2010 Pearson Education, Inc. Range of Visible Light Our eyes can see from 400 (blue/purple) to 700 (red) nm. Nm = nanometers = 10 -9 meters Our eyes

© 2010 Pearson Education, Inc.

Page 3: © 2010 Pearson Education, Inc. Range of Visible Light Our eyes can see from 400 (blue/purple) to 700 (red) nm. Nm = nanometers = 10 -9 meters Our eyes

© 2010 Pearson Education, Inc.

Continuous Spectrum

• The spectrum of a common (incandescent) light bulb spans all visible wavelengths, without interruption.

Page 4: © 2010 Pearson Education, Inc. Range of Visible Light Our eyes can see from 400 (blue/purple) to 700 (red) nm. Nm = nanometers = 10 -9 meters Our eyes

© 2010 Pearson Education, Inc.

Emission Line Spectrum

• A gas cloud emits light only at specific wavelengths that depend on its composition and temperature, producing a spectrum with bright emission lines.

Page 5: © 2010 Pearson Education, Inc. Range of Visible Light Our eyes can see from 400 (blue/purple) to 700 (red) nm. Nm = nanometers = 10 -9 meters Our eyes

© 2010 Pearson Education, Inc.

Absorption Line Spectrum

• A cloud of gas between us and a light bulb can absorb light of specific wavelengths, leaving dark absorption lines in the spectrum.

Page 6: © 2010 Pearson Education, Inc. Range of Visible Light Our eyes can see from 400 (blue/purple) to 700 (red) nm. Nm = nanometers = 10 -9 meters Our eyes

© 2010 Pearson Education, Inc.

How does light tell us what things are made of?

Page 7: © 2010 Pearson Education, Inc. Range of Visible Light Our eyes can see from 400 (blue/purple) to 700 (red) nm. Nm = nanometers = 10 -9 meters Our eyes

© 2010 Pearson Education, Inc.

Chemical Fingerprints

• Each type of atom has a unique set of energy levels.

• Each transition corresponds to a unique photon energy, frequency, and wavelength.

Energy levels of hydrogen

Page 8: © 2010 Pearson Education, Inc. Range of Visible Light Our eyes can see from 400 (blue/purple) to 700 (red) nm. Nm = nanometers = 10 -9 meters Our eyes

© 2010 Pearson Education, Inc.

Page 9: © 2010 Pearson Education, Inc. Range of Visible Light Our eyes can see from 400 (blue/purple) to 700 (red) nm. Nm = nanometers = 10 -9 meters Our eyes

© 2010 Pearson Education, Inc.

• Downward transitions produce a unique pattern of emission lines.

Chemical Fingerprints

Page 10: © 2010 Pearson Education, Inc. Range of Visible Light Our eyes can see from 400 (blue/purple) to 700 (red) nm. Nm = nanometers = 10 -9 meters Our eyes

© 2010 Pearson Education, Inc.

• Because those atoms can absorb photons with those same energies, upward transitions produce a pattern of absorption lines at the same wavelengths, producing an absorption spectrum.

Chemical Fingerprints

Page 11: © 2010 Pearson Education, Inc. Range of Visible Light Our eyes can see from 400 (blue/purple) to 700 (red) nm. Nm = nanometers = 10 -9 meters Our eyes

© 2010 Pearson Education, Inc.

Chemical Fingerprints

• Various emission spectra.

Page 12: © 2010 Pearson Education, Inc. Range of Visible Light Our eyes can see from 400 (blue/purple) to 700 (red) nm. Nm = nanometers = 10 -9 meters Our eyes

© 2010 Pearson Education, Inc.

Clicker Question

Which letter labels the peak (greatest intensity) of infrared light?

Page 13: © 2010 Pearson Education, Inc. Range of Visible Light Our eyes can see from 400 (blue/purple) to 700 (red) nm. Nm = nanometers = 10 -9 meters Our eyes

© 2010 Pearson Education, Inc.

Clicker Question

Which letter labels the peak (greatest intensity) of infrared light?

Page 14: © 2010 Pearson Education, Inc. Range of Visible Light Our eyes can see from 400 (blue/purple) to 700 (red) nm. Nm = nanometers = 10 -9 meters Our eyes

© 2010 Pearson Education, Inc.

Clicker Question

Which letter labels emission lines?

Page 15: © 2010 Pearson Education, Inc. Range of Visible Light Our eyes can see from 400 (blue/purple) to 700 (red) nm. Nm = nanometers = 10 -9 meters Our eyes

© 2010 Pearson Education, Inc.

Clicker Question

Which letter labels emission lines?

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