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## Sunday Physics:: The Second Law of Thermodynamics

The Second Law of Thermodynamics

Dr. S.V. M Sathyanarana

On Line Lecture Given in Sunday Physics (Apr19, 2020)

Thanks to Rithish Bharat for making the pdf copy available.

## Scattering

When I started teaching, I was asking the same question which every one asks:
What area  is cross section. Internet was not  yet invented. Combed through books
Found an excellent treatment in
R. D.Evans "The Atomic Nucleus" Tata McGraw Hill Publishing Co. (1955)
You always learn something extra from Masters..

As a bonus found definition and discussion cross section for waves.
Also when you go to quantum theory, since everything has dual nature.
You should ask which definition should be used Evas tells you that you can use any one.