Physics II Leeson Name________________________________ _______ Block_____ Date______________________ Test X, Waves and Light 100 I. Matching (2) A. Period F. Refract B. Reflect G. Normal C. Amplitude H. Electromagnetic Spectrum D. Wavelength I. Propagate E. Equilibrium J. Diffract ___1. Distance from one point to the next corresponding point along a wave. ___2. A wave spreads from a source in the shape of a sphere. ___3. A line perpendicular to a surface where a ray strikes. ___4. A wave bends and changes its speed upon entering a different medium. ___5. A wave rebounds after striking a surface. ___6. A strait line that represents the path of a wave with no energy. ___7. The collection of all frequencies of light. ___8. The time it takes for one wave to pass a given point. ___9. Distance from the equilibrium. ___10. The tendency of a wave to continue going. II.Supply the units for the following concepts (2) velocity _________________ frequency _________________ ___________________ wavelength _________________ period _________________ III. Reflection (10) A. Label the diagram (6 things) B. What is the relationship between and ? IV. Refraction – Measure and label the 2 critical angles, and calculate n. (15) If the angle of incidence is changed to 40o, what will the new angle of refraction be? V. Multiple choice - The following concern the same prism made of glass. (2) ___1. If a ray of light in air passes into a new substance that has an index of 1.66, then the new medium is ____________________________ compared to air. A. less optically dense B. more optically dense C. equally optically dense D. opaque E. translucent ___2. The ray has been: A. reflected. B. refracted with an angle of 0o. C. refracted away from the normal. D. refracted toward the normal. VI. Draw several (at least 4) rays coming from the object, so that you can show where the image will be. Draw the image as well, of course. (10) VII. Describe/define and give examples of each of the following. Draw SOMETHING, so I can tell that you will remember these ideas. (3%) 1.Electromagnetic Spectrum - 2.Compression (longitudinal) waves - 3.Transverse waves - VIII. Problems – Show equations and work for each. (4) ____________1. If a wave has a frequency of 500Hz, what is its period? ____________2. If a wave has a period of 0.002s, what is its frequency? ____________3. If a sound has a frequency of 500Hz, and a velocity of 346m/s, what is its wavelength? ____________4. If a light wave has a wavelength of 0.24m, what is its frequency? __________5. A ray of light is shining up through a swimming pool. If the angle of incidence is 25o (in this water, n=1.38), calculate the angle of refraction as the ray passes into the air (n=1.000293).