252CHAPTER 22 22.41(a) Snell’s law can be written as 122sinsinvv1θ=. At the critical angle of incidence ()1c=, the angle of refraction is 90° and Snell’s law becomes 12sincvv=. At the concrete-air boundary, 1112343 m ssinsin10.71850 m scvv−−===°(b) Sound can be totally reflected only if it is initially traveling in the slower medium. Hence, at the concrete-air boundary, the sound must be traveling in air . (c) S, so the wall is a good mirror. ound in air falling on the wall from most directions is 100% reflected22.42The sketch at the right shows a light ray entering at the painted corner of the cube and striking the center of one of the three
This is the end of the preview. Sign up
access the rest of the document.
This note was uploaded on 12/09/2011 for the course PHYS 2020 taught by Professor Staff during the Fall '10 term at FIU.