How to make the approximations in the Rosencwaig and Gersho paper of photoacoustic effect?

Hi, I am studying Rosencwaig and Gersho's article on the photoacoustic effect (J. App Phys 47, 64 (1976)) and I have had some doubts. It is difficult to understand how the approximations were made...

29 July 2021 4,553 0 View