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# Waves 2 d test review

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### Waves 2 d test review

1. 1. W AVES IN 2D T EST R EVIEW1. Draw a circular and a plane wavefront, and label the wavefront. Draw in a wave ray for each of these.2. Draw the following diagram. Label the wavefront, wave ray and the angle of incidence.3. Add to your drawing two reflected wavefronts, a reflected wave ray and label the angle of reflection.4. State the law of reflection.
2. 2. 5. A man who stands 2 meters tall stands in front of a mirror. He is a smart man, so he has a large forehead (the top of his head is 20 cm above his eyes). What size of mirror would he need and where on the wall should he place it if he wants to see is shoes and the top of his head.6. A plane water wave (straight) approaches a parabolic barrier (a semi-circular beach shore). Draw a diagram of two incident wave fronts, two reflected wave fronts. Add wave rays to these. **Provide an example (with picture) of one way we used reflection in order to produce energy.7. Describe the reflected wave front that occurs when a circular wave originates at the focal point of a parabolic barrier.
3. 3. 8. Measure the angle at which mister Vincent shines a laser through the small glass box at the front. Calculate the theoretical angle of refraction.9. When waves go from deep water into shallow water, what happens to the wavelength, frequency and velocity of that wave?10. Refraction refers to:11. Label all important parts of this diagram? What situation does this represent?
4. 4. 12. When waves travel from shallow water into deeper water at an angle, what happens to their speed? Their wavelength? What type of refraction does this cause? (with respect to the normal)13. A water wave of frequency 15.0 Hz and speed 50.0 m/s is traveling in deep water. It then moves into shallow water where its speed is 40.0 m/s. The angle of incidence is 29°. Finda) the index of refractionb) the wavelengths in the two mediac) the angle of refraction in the shallow water14. In your own words, explain this diagram:15. What would change in the previous diagram if they waves were closer together? Further apart?
5. 5. 16. What conditions provide the greatest diffraction when a wave passes through an opening?17. IF you are hiding behind a tree during a game of Marco Polo, whose voice is likely to diffract more and why. Your low pitch (frequency) voice, or your friends high pitched (frequency) voice and why.18. What are the fundamental frequencies of the following guitar strings when the speed of the wave on the string is 200 m/s? 20 cm 40 cm 60 cm19. The third overtone of a particular string occurs at 400 Hz. What is the fundamental frequency of this string? If the speed of the wave is 50 m/s, what is the wavelength of the second overtone? What is the length of the string being used?20. Make a diagram showing the fourth harmonic of a standing wave. Label all important parts
6. 6. 1.