Light Waves

1. A review for the quiz Light Waves

2. Sound waves from a radio generally travel in which medium? • air • light • earth • water

3. Our eyes can detect light only within a range of _____ called visible light. • frequencies • mediums • speeds • periods

4. The speed of a sound wave • depends on wavelength. • depends on amplitude. • depends on the medium. • None of the above

5. Longitudinal waves travel quickly in a _____ because the molecules are closely packed and physically bonded together. • liquid • solid • gas • None of the above

6. The differences in color in visible light, such as those in a rainbow, are caused by differences in • amplitude. • medium. • speed. • frequency.

7. Light waves • require a medium. • cannot travel through liquids. • cannot travel through solids. • are electromagnetic waves.

8. Light waves are • transverse waves. • rotating waves. • longitudinal waves. • circular waves.

9. The color of light is determined by the _____ of the light waves. • medium • frequency • speed • amplitude

10. Which type of electromagnetic waves has the highest energy? • gamma rays • infrared • ultraviolet light • microwaves

11. Which type of electromagnetic radiation is used to kill cancer cells? • microwaves • ultraviolet rays • gamma rays • sunlight

12. Radar works by sending a signal out from an air-traffic control tower that is • analyzed by a Doppler scanner on the ground. • reflected off a plane back to the control tower. • increased in intensity as it passes through the atmosphere. • scanned and analyzed by a receiver on board an airplane.

13. The color that an object appears to be depends on the • angle at which visible light is reflected off the object. • use of additive rather than subtractive colors. • wavelengths of visible light that reaches your eyes. • speed with which visible light reaches it.

14. When light moves from a material in which its speed is higher to a material in which its speed is lower, it is • bent toward the normal. • reflected off the boundary. • bent away from the normal. • changed into a virtual image.

15. Light rays that pass through a lens change direction because • of internal reflection. • they are refracted. • light is broken up into many different colors. • virtual images always appear slightly larger than real images.

16. Light demonstrates wave characteristics when it is • reflected. • diffracted. • refracted. • All of the above

17. Light demonstrates particle characteristics when it • knocks electrons off a metal surface. • forms standing waves. • passes through a narrow opening. • All of the above

18. As the frequency of light waves increases, • the energy increases. • the energy stays the same. • the energy decreases. • the wavelength increases.

19. Light rays reflecting off a rough surface reflect • diffusely. • at all angles. • at a single angle. • None of the above

20. The law of reflection says the angle of incidence is _____ the angle of reflection. • greater than • equal to • less than • None of the above

21. When you look in a convex mirror, the image appears • smaller than it really is. • larger than it really is. • lighter than it really is. • darker than it really is.

22. Which statement about a diverging lens is correct? • It bends light inward and can create either a virtual or a real image. • It bends light inward and can only create a real image. • It bends light outward and can create either a virtual or a real image. • It bends light outward and can only create a virtual image.

23. Light is composed of waves and particles called: • electrons • photons • quarks • waves

24. The visible spectrum of light from the longest to shortest wavelength is: • violet, indigo, blue, green, yellow, orange, red • red, orange, yellow, green, blue, indigo, violet • infrared, ultraviolet, gamma, x-rays, microwaves • green, orange, red, violet

25. A magnifying glass is an example of a: • convex lens • prism • concave lens • convex mirror

26. Convex lenses converge light rays to a: • real image • focal point • focus • virtual image

27. An example of a diverging lens that spreads light rays is the: • convex lens • converging lens • concave lens • prism

28. A survivor from a shipwreck sees an image of a fish in the water. To catch it with her spear, she must • aim above the image of the fish • aim at the image of the fish • aim below the image of the fish • aim behind the fish

29. When the crests of one wave overlap the crests of another wave or wave, this occurs • diffraction • constructive interference • destructive interference • resonant frequencies

30. An echo is the result of a • reflected sound wave • refracted sound wave • diffracted sound wave • dispersed sound wave

31. What happens to a wave when it is refracted? • It is bent • It is reflected • It is diffracted • It is radiated

32. optics • convex • image • convergent • object • divergent • concave ____ 31. The study of how light behaves. ____ 32. A lens or mirror that is bigger in the middle. ____ 33. light rays that spread apart ____ 34. Where your eyes think something is. ____ 35. Light ray that come together. ____ 36. What you are actually looking at. ____ 37. A lens or mirror that is bigger at the ends.

33. Normal • angle of reflection • Mirror • lens • angle of incidence • focus ____ 38. a line drawn perpendicular to the surface of a mirror or lens ____ 39. An optical device that works by refraction to bend light. ____ 40. from the normal to the incoming ray. ____ 41. from the normal to the outgoing ray ____ 42. Where all parallel rays come together ____ 43. an optical device that works by reflection

34. photon • EM Spectrum • prism • energy level • light ____ 44. An orbit of electrons. To move from low to high requires energy. ____ 45. all light: visible and invisible ____ 46. used to separate white light into its colors ____ 47. a single particle or packet of light ____ 48. a wave that can travel through a vacuum

35. Arrange the Electromagnetic Spectrum from low photon energy to high photon energy • Gamma Rays • X-rays • Infrared • Ultraviolet • Microwaves • Visible Light • Radio Waves ____ 49. Lowest Photon Energy ____ 50. ______ ____ 51. ______ ____ 52. ______ ____ 53. ______ ____ 54. ______ ____ 55. Highest Photon Energy

36. Convex and Concave Lens

37. Convex and Concave Mirrors

38. Primary Colors of Light

39. Total internal Refraction

40. Mirage- Optical Illusions two opposing parabolic mirrors

41. Fun with Refraction and Reflection