Revision of Last Week

How many electronic transitions are possible in UV-Visible spectroscopy?

• 3

• 4

• 5

• 6

UV radiation extends from

• 10 nm to 400 nm

• 100 nm to 400 nm

• 50 nm to 400 nm

• 150 nm to 400 nm

Energy and Wavelength are ---------- to each other.

• Directly proportional

• Inversely proportional

UV spectrum is a plot of ------------ versus absorption intensity

• frequency

• wavelength

• wavenumber

• energy

UV-Visible region is

• 100-900 nm

• 200-500 nm

• 100-800 nm

• 200-800 nm

When a molecule absorbs energy in the UV or Visible region

-------------------- transition takes place?

• Vibrational

• Rotational

• Electronic

• Vibrational-rotational