15. When a wave hits a material interface , it can be absorbed , reflected or transmitted by the second material . describe what happens in each of these cases ?
What is first maxwell equation.
Two systems A and B are arranged so that their total volume is constant, but their individual volumes can change. Calculate the standard deviation of fluctuations in the volume in system A for constant energy. (Hint: see section 4.5 for the analogous calculation of the fluctuation ill energy.)