Q1. What is Em radiation and what are chr. of EM radiation?

→ EM radiation is simple harmonic wave of electric and magnetic fields fluctuating orthogonal to each other.

Q2. Terms

Q7. what do you mean by spectroscopy? what are advantages over classical techniques

Spectroscopy refers to a scientific method used for studying the interaction between matter and electromagnetic radiation with matter. EM radiation is simple harmonic wave of electric and magnetic fields fluctuating orthogonal to each other.