In an atomic absorption spectrum experiment, Linsey treated a gaseous He+ sample in first excited state with a laser beam that contains all light in range that (100 nm ≤ λ ≤ 300 nm). 1 ??????? = 2.18 × 10−18 ? a) What is spectral region of this laser beam used? (i.e. Are they UV light? purple light? Infrared radiation?) b) Calculate the maximum and minimum Ephoton in this laser beam. c) Linsey observed a total of 4 dark lines on the bright background in their final absorption spectrum. Explain the physical meaning of the dark lines on the spectrum. Then use an energy level diagram to analyze what each line corresponds to. (Hint: assume activated electrons will not be activated again) d) Calculate the wavelength of the first line (low wavelength lines appear first) on the absorption spectrum.
In an atomic absorption spectrum experiment, Linsey treated a gaseous
He+
sample in first excited state with a laser beam that contains all light in range
that (100 nm ≤ λ ≤ 300 nm).
1 ??????? = 2.18 × 10−18 ?
a) What is spectral region of this laser beam used? (i.e. Are they UV light?
purple light? Infrared radiation?)
b) Calculate the maximum and minimum Ephoton in this laser beam.
c) Linsey observed a total of 4 dark lines on the bright background in
their final absorption spectrum. Explain the physical meaning of the dark lines
on the spectrum. Then use an energy level diagram to analyze what each line
corresponds to. (Hint: assume activated electrons will not be activated again)
d) Calculate the wavelength of the first line (low wavelength lines appear
first) on the absorption spectrum.
Uv Range is 200-400nm.So spectra is in UV range.
Light range is 100 nm To 300nm.
energy of photon =E=hc/λ
Max=(6.626×10^-34 )×(3×10^8)/100×10-9m = 1.988×10^-18J
Min =(6.626×10^-34 )×(3×10^8)/300×10-9m = 1.988×10^-18
=6.626×10^-19J
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