Spectroscopy

Question 1

Spectroscopy

Answer 1

Study of electromagnetic radiation and its interaction with matter

Question 2

Light

Answer 2

Composed of photons which have particle-like and wave - like properties

Question 3

Wavelength

Answer 3

Distance between 2 identical positions on wave

Question 4

Frequency

Answer 4

Number of crests passing a particular point per second

Question 5

Amplitude

Answer 5

Distance between resting position and the max displacement

Question 6

Electromagnetic wave

Answer 6

Has a magnetic and electric component, it interacts with electrons

Question 7

Energy of uv radiation

Answer 7

Similar to chemical bonding and caused by movement of electrons

Question 8

Absorption of uv radiation

Answer 8

Absorbed at a particular wavelength corresponding to a particular electronic transition

Question 9

Monochromator

Answer 9

Has a slit to select a particular wavelength

Question 10

Pathlength

Answer 10

Thickness of cell

Question 11

Beer - lambert law

Answer 11

Describes light absorption

Question 12

Transmittance

Answer 12

Concentrated solution has a low transmission and vice verse

Question 13

Intensity

Answer 13

Proportional to number of photons

Question 14

Factors affecting absorption

Answer 14

Solution length and concentration

Question 15

Molar absorptivity

Answer 15

Specific, depends on chemical nature of compound and is quoted at max wavelength

Question 16

Light sources

Answer 16

Tungsten and deuterium

Question 17

Light dispersion techniques

Answer 17

Filter, prism and diffraction grating

Question 18

Measuring molar absorptivity

Answer 18

From calibration graph or using absorbance data