Instrumental Analysis - Exam 1 questions with
verified answers
+/- of bunching Ans✓✓✓ +: draws line of best fit to get better
determination of signal
-: can use to much and toss peaks which were signal and not noise
3 electrical domains Ans✓✓✓ 1. analog (encoded as a magnitude of
electrical quantities)
2. time - signal fluctuations per unit time (a frequency reading)
3. digital (most common, usually a computer)
Beer's Law Ans✓✓✓
Black body radiation Ans✓✓✓ aka thermal radiation
creates continuous spectrum, radiation from temp of surface,
oscillations in excited solids)
bunching Ans✓✓✓ averaging certain # points into one point on
spectrum
, chemical noise vs instrumental noise Ans✓✓✓ chemical =
uncontrollable (temp, pressure, etc.)
instrumental = from components of instrument (thermal, shot, flicker,
environmental)
Components of optical instruments Ans✓✓✓ 1. stable source of
radiant energy
2. transparent container for holding sample
3. device for isolating desired region of spectrum
4. radiator detector
5. signal processor and readout
continuum energy sources Ans✓✓✓ emit radiation that changes
intensity slowly as a function of wavelength
data domains Ans✓✓✓ modes of encoding, going from one system to
another to extract information
detection limit Ans✓✓✓ minimum Amt of analyte that can be detected
with known confidence i.e. how little do i need to detect anything
verified answers
+/- of bunching Ans✓✓✓ +: draws line of best fit to get better
determination of signal
-: can use to much and toss peaks which were signal and not noise
3 electrical domains Ans✓✓✓ 1. analog (encoded as a magnitude of
electrical quantities)
2. time - signal fluctuations per unit time (a frequency reading)
3. digital (most common, usually a computer)
Beer's Law Ans✓✓✓
Black body radiation Ans✓✓✓ aka thermal radiation
creates continuous spectrum, radiation from temp of surface,
oscillations in excited solids)
bunching Ans✓✓✓ averaging certain # points into one point on
spectrum
, chemical noise vs instrumental noise Ans✓✓✓ chemical =
uncontrollable (temp, pressure, etc.)
instrumental = from components of instrument (thermal, shot, flicker,
environmental)
Components of optical instruments Ans✓✓✓ 1. stable source of
radiant energy
2. transparent container for holding sample
3. device for isolating desired region of spectrum
4. radiator detector
5. signal processor and readout
continuum energy sources Ans✓✓✓ emit radiation that changes
intensity slowly as a function of wavelength
data domains Ans✓✓✓ modes of encoding, going from one system to
another to extract information
detection limit Ans✓✓✓ minimum Amt of analyte that can be detected
with known confidence i.e. how little do i need to detect anything
