UV-Visible Spectroscopy

UV radiation extends from

• 10 nm to 400 nm

• 100 nm to 400 nm

• 50 nm to 400 nm

• 150 nm to 400 nm

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

• frequency

• wavelength

• wavenumber

• energy

UV spectrum is sharp say yes or no

• yes

• no

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

Which among the following impart colour to the organic compound?

• Auxochrome

• Chromophore

• Chromone

• Auxochromone

Light is an

• Electric radiation

• Magnetic radiation

• Electrochromic radiation

• Electromagnetic radiation

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

• infrared
• ultraviolet
• microwaves
• radiowaves

Which of the following type of electromagnetic  radiation has the longest wavelength

• infrared
• ultraviolet
• microwaves
• radiowaves

For an electron to change from ground state to an excited stated it must...

• Absorb energy
• Release energy