1
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Instrumental Analysis Final Questions and
Answers (100% Correct Answers) Already
Graded A+
refractive index [ Ans: ] measure of the interaction between EMR
and matter
=c/v
© 2025 Assignment Expert
fourier transform [ Ans: ] can be used to deconvolute a complex
waveform into a sum of simple sine and/or cosine waves
takes a time domain signal and converts it to the frequency
domain
Guru01 - Stuvia
diffraction [ Ans: ] parallel beam of EMR is bent as it passes
through narrow slit
refraction [ Ans: ] abrupt change in the direction when EMR
passes between media with different refractive index
reflection [ Ans: ] light bounces off a medium
photoelectric effect [ Ans: ] if the frequency of incident light is
above a threshold, it can cause electron to be emitted from a
metal photocathode. these electrons generate a photocurrent
that can be measured
low ionization energy = low ___ [ Ans: ] frequency
____ is not energetic enough to overcome the work function [
Ans: ] low frequency light
Intensity is directly proportional to ___ [ Ans: ] photons/second
types of emission from shortest to longest wavelength [ Ans: ]
gamma, x-ray, UV, visible, IR, microwave, radio
radiation [ Ans: ] EMR produced when excited particles relax to
a lower energy level
, 2
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ways to excite particles [ Ans: ] heat, spark, plasma, high
voltage, EMR, chemical reaction (exothermic)
line spectrum [ Ans: ] derived from individual atoms in the gas
phase
sharp lines with typical width pf ~10^-4Å
band spectra [ Ans: ] derived from gaseous radicals/small
molecules
results from numerous vibrational and rotational energy levels that
are superimposed on ground state
continuum spectra [ Ans: ] ex. the spectrum of blackbody
radiation
© 2025 Assignment Expert
as heat increases, wavelength of maximum emission decreases
absorbance formula [ Ans: ] A = -log(T) = -log(I/Io) = ɛbc
radiation sources [ Ans: ] continuum source and line source
Guru01 - Stuvia
continuum source examples [ Ans: ] Tungsten filament bulb
D2 lamp (most common for UV region)
globar or nernst flower for IR
very narrow wires = high ___ = higher ___ = ___ [ Ans: ] resistance
power
heat
line source example [ Ans: ] hollow cathode lamp (most
common for AA)
reflection grating formula [ Ans: ] nλ = d(sin i + sin r)
if you are given the value 2000 lines/mm, what is d? [ Ans: ] d =
(1mm/2000lines) x (10^6 nm/1mm) = 500 nm/line
prefer large or small dispersion? [ Ans: ] large bc wavelengths
are well separated
reciprocal linear dispersion [ Ans: ] Echellete and Echelle grating
don't want f too large, as this would reduce light gathering power
For Expert help and assignment solutions, +254707240657
Instrumental Analysis Final Questions and
Answers (100% Correct Answers) Already
Graded A+
refractive index [ Ans: ] measure of the interaction between EMR
and matter
=c/v
© 2025 Assignment Expert
fourier transform [ Ans: ] can be used to deconvolute a complex
waveform into a sum of simple sine and/or cosine waves
takes a time domain signal and converts it to the frequency
domain
Guru01 - Stuvia
diffraction [ Ans: ] parallel beam of EMR is bent as it passes
through narrow slit
refraction [ Ans: ] abrupt change in the direction when EMR
passes between media with different refractive index
reflection [ Ans: ] light bounces off a medium
photoelectric effect [ Ans: ] if the frequency of incident light is
above a threshold, it can cause electron to be emitted from a
metal photocathode. these electrons generate a photocurrent
that can be measured
low ionization energy = low ___ [ Ans: ] frequency
____ is not energetic enough to overcome the work function [
Ans: ] low frequency light
Intensity is directly proportional to ___ [ Ans: ] photons/second
types of emission from shortest to longest wavelength [ Ans: ]
gamma, x-ray, UV, visible, IR, microwave, radio
radiation [ Ans: ] EMR produced when excited particles relax to
a lower energy level
, 2
For Expert help and assignment solutions, +254707240657
ways to excite particles [ Ans: ] heat, spark, plasma, high
voltage, EMR, chemical reaction (exothermic)
line spectrum [ Ans: ] derived from individual atoms in the gas
phase
sharp lines with typical width pf ~10^-4Å
band spectra [ Ans: ] derived from gaseous radicals/small
molecules
results from numerous vibrational and rotational energy levels that
are superimposed on ground state
continuum spectra [ Ans: ] ex. the spectrum of blackbody
radiation
© 2025 Assignment Expert
as heat increases, wavelength of maximum emission decreases
absorbance formula [ Ans: ] A = -log(T) = -log(I/Io) = ɛbc
radiation sources [ Ans: ] continuum source and line source
Guru01 - Stuvia
continuum source examples [ Ans: ] Tungsten filament bulb
D2 lamp (most common for UV region)
globar or nernst flower for IR
very narrow wires = high ___ = higher ___ = ___ [ Ans: ] resistance
power
heat
line source example [ Ans: ] hollow cathode lamp (most
common for AA)
reflection grating formula [ Ans: ] nλ = d(sin i + sin r)
if you are given the value 2000 lines/mm, what is d? [ Ans: ] d =
(1mm/2000lines) x (10^6 nm/1mm) = 500 nm/line
prefer large or small dispersion? [ Ans: ] large bc wavelengths
are well separated
reciprocal linear dispersion [ Ans: ] Echellete and Echelle grating
don't want f too large, as this would reduce light gathering power
