K PH 117 Exam 1 10/2/18 Collaborations of 1. Why does sound not travel through outer space? 2. Name two differences between a radio wave and a sound wave. 3. We did an activity with an object placed between a lightbulb and a screen. Where should the object be placed in order to form the most distinct shadow edges? 1 4. (4 pts) An object is placed in front of a concave mirror with the shown focal point. (A) Draw two rays needed to locate the image. (B) Classify the image as being (upright or inverted), and [real or virtual] 5. A clean whiteboard and a mirror both reflect most of the light that shines on them. Why can you see yourself in one and not in the other? 6. Why does our sky appear blue? 7. If a material has electrons with resonant frequencies matching the frequency of electromagnetic waves that shine on it, will the material be transparent or opaque to those waves? 8. (4 pts) A lemon normally appears the color of mustard if illuminated with white light. There is a "white" screen behind the lemon with two shadows from the Blue (B) and Green (G) lights illuminating the lemon. What color would appear in each of the numbered regions? 1 4 다. 2 3 4 9. A ray of light enters each of three different containers from the same angle, but refracts differently in each. Rank the speed of light in each container from the highest to the lowest: Highest Lowest w S 16. Which of the following does a plane mirror reverse? (A) Left-Right (B) Up - Down (C) Front - Back (D) All of these 17. Johnny does not have a "purple" shirt for Wednesdays, but he does have one that appears magenta when illuminated with white light. What if Johnny were to wear that shirt while illuminated with only the ideal yellow light. What color would it appear? 18. Printers use ink with colors of magenta, yellow, and cyan. Which color(s) would be used to make a blue spot on the page? 19. A converging lens is used to form an image of a light bulb on a screen. What happens to the image if half of the lens is covered? 20. One of the figures below represents an AM wave, and the other represents an FM wave. Label which is which. www 21. A person wears eyeglasses that make her eyes appear smaller than when she is not wearing them. The type of lens that does this is called {converging, diverging), and the person is probably [near-sighted, far-sighted] PH 117 Exam 110/2/18 Sole work of Moun Alanberi 10. Why does dispersion of light occur? (A) Higher frequencies travel faster than lower frequencies (B) Longer wavelengths travel slower than shorter wavelengths (C) Dispersion does not occur (D) Some materials have electrons with resonant frequencies near the frequency of light (E) The creator loves us and wants us to be happy 11. Mirages occur because of which of the following? (A) Reflection (B) Refraction (C) Diffraction (D) Interference 12. A car moving between Anna (A) and Bob (B) while making sound as indicated in the figure. (i) Who hears the higher pitch? A llll )))) 38 (ii) Who is the car moving toward? 13. A guitarist plucks a string to make a sound. He then plucks a second string making a lower pitched sound. Which sound has the longer wavelength? 14. When a wave refracts, all of the following can change except which? (A) wavelength (B) frequency (C) speed (D) direction 15. (3 pts) A candle placed in front of a converging lens forms a focused image on a screen beyond the lens. If the candle is moved farther away from the lens, (A) does the screen need to be moved closer to the lens, or farther away? (B) How is the size of the image changed when you move the screen?
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