PHYS 202 Midterm: PHYS 202 TAMU s09 Exam 4 Solutions
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Note: the speed of light in air is c = 3. 00 x 108 rn/s. No work need be shown and no partial credit will be given. (5 pts) 1. Two coherent speakers emit electromagnetic waves that have wavelength 2. 0 in. At a point 3. 0 in from one source and 7. 0 m from the other source, the interference between these two waves is jsructive (h) constructie (5 pts) 2. A monochromatic beam of laser light passes through two very narrow parallel slits. The light passes through air to a screen that is 5. 0 m from the slits. It is observed that near the center of the screen. adjacent bright fringes are separated by 1. 2 mm. If the entire apparatus (slits, screen and the space between them) is submerged in water that has refractive index 1. 33, the separation between adjacent bright fringes becomes (a) 1. 6 mm (b 1. 2 mm (doesn"t change) C c) 0. 90 mm above (5 pts) 3.
