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7. An electromagnetic wave has a wavelength of 1.15 x 10 m. Under what portion of the electromagnetic spectrum does it fall? 8. Explain in general terms why x-rays and gamma rays are especially likely to cause cancers in the cells of the skin, bone marrow and intestinal lining. Lesson 2: The Speed of Light 9. Using the Michelson-like apparatus diagrammed below, the observer found that in order to observe the return light ray, the mirror had to rotate at 707.1 Hz. What is the speed of light calculated from this experiment? (2.97 x 105 m/s) observer Stationary reflecting mirror 7v Rotating six- sided mirror light source 35 km 10. When verifying the speed of light, a student set up a pentagonal rotating mirror and a reflecting mirror 35 km away. At what minimum frequency must the mirror rotate so that the reflected light is seen by the observer? (857 Hz) 11. A student sets up a Michelson-type experiment for a twelve-sided rotating mirror. If the mirror spun at a rate of 125 Hz, how far was the rotating mirror from the stationary reflecting mirror? (100 km) Lesson 3: Reflection (spherical mirrors) 12. A 6.0 cm tall object is placed 40 cm in front of a concave mirror with a radius of curvature of 60 cm. a. What is the image distance? (120 cm) b. What is the size of image produced? (-18 cm) C. Describe the image. (inverted, real, larger)13. A 6.0 cm tall object is placed 40 cm in front of a convex mirror with a radius of curvature of 60 cm. a. What is the image distance? (-17 cm) b. What is the size of image produced? (2.6 cm) c. Describe the image. (erect, virtual, smaller) 14. An object located 40 cm in front of a mirror produces an erect image 80 cm from the mirror. a. What is the radius of curvature for the mirror? (160 cm) b. What type of mirror is it? (concave) 15. An object located 40 cm in front of a mirror produces an inverted image 120 cm from the mirror. a. What is the radius of curvature for the mirror? (60 cm) b. What type of mirror is it? (concave) 16. An object located 40 cm in front of a mirror produces an erect image 20 cm from the mirror. What is the radius of curvature for the mirror? (-80 cm) b. What type of mirror is it? (convex) 17. A 20 cm object located 30 cm in front of a mirror generates an erect image that is 10 cm tall. What is the size of image produced when the object is moved 60 cm further from the mirror's surface? (5.0 cm) 18. An object located in front of a concave mirror with a radius of curvature of 80 cm produced an inverted image that is three times the size of the object. What is the object distance? (53 cm) 19. An object located in front of a concave mirror with a radius of curvature of 180 cm produced an erect image that is two times the size of the object. What is the object distance? (45 cm) 20. An object located in front of a convex mirror with a focal length of 60 cm produced an erect image that is 1/6 the size of the object. What is the object distance? (300 cm) Lesson 4: Refraction (Snell's Law) 21. The speed of light in a certain plastic is 2.0 x 10 m/s. What is the refractive index of the plastic? (1.5) 22. The index of refraction of crown glass for violet light is 1.53 and for red light 1.52. Assuming that the velocity of ight in a vacuum is 3.00 x 108 m/s, what are the speeds of violet light and red light in crown glass? (1.96 x 105 m/s, 1.97 x 10# m/s) 23. A beam of light strikes the surface of water with an incident angle of 60". Some of the light reflects off the water and some refracts into the water. If water has an index of refraction of 1.33, determine the angles of reflection and refraction. (60', 41") 24. A wave travelling from air to glass (n = 1.52) has an angle of incidence of 30". What is the angle of refraction? (19") 25. If the angle of incidence is 20" and the angle of refraction is 10", what is the index of refraction of the material if the wave started in air? (1.97) 26. What is the wavelength of light in water if the wavelength in air is 570 nm? (429 nm)1?. A ray of light enters from air to: water and then into glass as shown in the diagram. Find the angle of refraction in glass. [fl-"mgr: 1.33, "gags: 1.50} [33\": w , 35\" air 2 water glass