Module 7: Spectrophotometers

Question 1

Tungsten-halogen lamps generate which light:

Answer 1

Mainly visible, some UV

Question 2

Hydrogen/deuterium lamps generate:

Answer 2

Mainly UV light

Question 3

Mercury/xeon arc lamps generate:

Answer 3

High intensity UV light

Question 4

LEDs generate:

Answer 4

Dedicated wavelengths

Question 5

LASERs generate:

Answer 5

High intensity, monochromatic light

Material type determines colour

Question 6

Borosilicate glass cuvet light range

Answer 6

Visible range only

Question 7

Quartz/silica cuvet light range

Answer 7

Visible and UV

Question 8

Plastic cuvet light range

Answer 8

Visible and UV

Question 9

Linear diode arrays

Answer 9

Large number of photodiodes each dedicated to read a small selection of wavelengths
Allows measuring of many wavelengths at once

Question 10

Reverse optics

Answer 10

Photometer arrangement where wavelength selector is placed after the curvet
Common with linear diode arrays in multichannel instruments
Can measure multiple analyses at the same time