A stone dropped in still water creates circular ripples that move away from the point of impact, X. The height of the ripple at point 1' is 2.8 cm and at point Z it is 1.5 cm. lCalculate the ratio of the energy,r carried by the wave at Y to that at Z . Red light of wavelength 6.8 X 113'? In in air enters glass with a re'aclive index of 1.583, with an angle of incidence of 38'\". Calculate: a) the angle of refraction b) the speed of light in the glass c) the wavelength of light in the glass. Light of frequency 6.12) x 1014' Hz is emitted from point A and is directed toward point B a distance of 3.13 In away. a) Determine how long will it take light to get to B. h) Calculate how man}r waves t in the space between A and B. Calculate the phase difference between the two displacement time graphs shown helm-v. Give the answers in: 3) seconds b) radians {1) degrees