The Intro to Spectroscopy (UV–Vis, IR) – Numerical Applications section is dedicated to quantitative problem solving involving spectroscopic principles. This module is designed for Class 11–12 students, undergraduate learners, and competitive exam aspirants, with strong emphasis on accuracy, formula application, and data interpretation.
In this section, you will practice:
Numericals on electromagnetic radiation – wavelength, frequency, energy, and photon calculations
Beer–Lambert law calculations – absorbance, concentration, molar absorptivity, and path length
UV–Vis quantitative analysis problems – concentration determination and calibration curves
Deviation-based numericals – instrumental, chemical, and real deviations from Beer’s law
IR spectroscopy calculations – wavenumber–wavelength conversions and frequency analysis
Spectral data interpretation numericals – peak position shifts and intensity comparisons
Mixed-data problems combining tables, graphs, and spectra
NCERT- and UG-aligned numerical MCQs, including previous-year and exam-pattern questions
The content is structured to build numerical confidence, minimize calculation errors, and improve speed under exam conditions.
Strengthen your quantitative command over UV–Vis and IR spectroscopy by mastering these numerical applications, essential for scoring well in school exams, UG assessments, and competitive Chemistry tests.
Q. If a compound has a molar absorptivity of 200 L/(mol·cm) and a concentration of 0.01 mol/L, what is the absorbance at a path length of 1 cm?
A.
0.2
B.
2
C.
20
D.
0.02
Solution
Using Beer-Lambert Law (A = εlc), A = 200 L/(mol·cm) * 0.01 mol/L * 1 cm = 2.
