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Physics 1: Electromagnetic Waves You DO NOT need to show your work! 10 Questions - Multiple Choice 1

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Physics 1: Electromagnetic Waves You DO NOT need to show your work! 10 Questions - Multiple Choice 1. A blue light is illuminating an apple that contains a red pigment. What color will the apple appear? Select one: a. Red b. Black c. Magenta d. Blue 2. Which term means a device that would bring light rays that are incident parallel to each other together? Select one: a. Convergent b. Transvergent c. Divergent 3. How does the frequency of microwaves compare to the frequency of ultraviolet waves? Select one: a. Ultraviolet waves have higher frequency. b. Ultraviolet rays have a lower frequency. c. There is no difference in frequency. 4. How does the direction of oscillation for the electric and magnetic field relate to each other in the propagation of electromagnetic radiation? Select one: a. The electric field is transverse and the magnetic field is longitudinal. b. They are both transverse and parallel to each other. c. They are both transverse and perpendicular to each other. d. The electric field is longitudinal and the magnetic field is transverse. 5. Which color of light, red with a long wavelength or blue with a short wavelength is higher in energy? Select one: a. Red b. Their energy is identical. c. Blue 6. Which behavior of light explains an upside down image being made by a pinhole camera? Select one: a. Light travels in straight lines. b. Light refracting as it goes through the hole, much like a lens. c. Light diffracting through the small opening. d. Angle of incidence equals the angle of reflection. 7. A light sensor is reading 500 lx when it is 1.0 meter away from a light source. What will it be reading when it is 2.0 meters away? Select one: a. 2000 lx b. 500 lx c. 250 lx d. 125 lx e. 1000 lx 8. How should the angle of incidence and reflection be measured? Select one: a. Both should be measured off of the surface of the mirror. b. Both should be measured off of the normal. c. Incidence is measured off the normal and reflection is measured off the mirror. d. Incidence is measured off the mirror and reflection is measured off the normal. 9. What happens to a ray of light as it goes from air into water? Select one: a. It gets bent away from the normal. b. Its incident and refracted angle are equal. c. It gets bent towards the normal. 10. Glass has an index of refraction of 1.5 and diamond 2.4. How does the speed of light compare in each material? Select one: a. The speed is lower in diamond. b. The speed is higher in diamond. c. There is no difference between the two materials. 8.09 – Physics 1: Electromagnetic Waves You DO NOT need to show your work! 20 Questions - 11 Multiple Choice, 8 Fill-in-the-Blank, 1 Matching 1. How does wavelength, frequency and energy change as you go from radio waves to gamma rays in the electromagnetic spectrum? Select one: a. Wavelength decreases, frequency decreases and energy decreases. b. Wavelength decreases, frequency increases and energy increases. c. Wavelength increases, frequency decreases and energy decreases. d. Wavelength increases, frequency increases and energy increases. 2. What are EM waves? Select one: a. Perpendicular oscillating electric charges and magnets. b. Parallel oscillating electric charges and magnets. c. Parallel oscillating electric and magnetic fields. d. Perpendicular oscillating electric and magnetic fields. 3. A green photon (particle of light) has just enough energy to knock an electron loose from a metal sample. Which other type of photon would also be able to knock an electron loose? Select one: a. Yellow b. Violet c. Infrared 4. When light passes through a diffraction grating and makes the characteristic diffraction pattern, is light behaving more like a particle (really small marble), a wave, or both? Select one: a. Both b. Wave c. Particle 5. In what situation will a curved mirror be able to make a real image? Select one: a. Concave inside the focus. b. Concave and outside of the focus. c. Convex outside the focus. d. Convex inside the focus. 6. Under which condition will a lens form a real image? Select one: a. A concave lens inside of the focus. b. A convex lens with the object outside of the focus. c. A concave lens outside of the focus. d. A convex lens with the object inside of the focus. 7. The refractive index of air is often given as 1. Given that light travels slightly slower in air than in a vacuum, the refractive index of air should actually be... Select one: a. Equal to one. b. Less than one. c. Greater than one. 8. Which of the following are divergent optical devices? Select one: a. Convex mirrors and concave lenses. b. Concave mirrors and convex lenses. c. Concave mirrors and lenses. d. Convex mirror and lenses. 9. A yellow light is illuminating a shirt with a cyan pigment. What color will the shirt appear? Select one: a. Green b. Red c. Yellow d. Blue 10. If it takes 8.3 minutes for the light from the Sun to reach the Earth, how many meters away is the Earth from the Sun? Answer: ___________________________ 11. If the index of refraction of water is 1.3, what is the speed of light in water in units of m/s? Answer: ____________________________ 12. Light from the air is incident on a piece of glass (n=1.5) at an angle of 30 degrees. What will the refracted angle be? Answer: _____________________________ 13. What would the critical angle be for a substance that has an index of refraction of 1.9? Answer: ______________________________ 14. At what distance from the lens should a note card be in order to make a clear image of a candle that is 50 cm away from a convex lens that has a focal length of 30 cm? Answer: ______________________________ 15. What is the magnification of an ant that is 2.0 cm away from a convex lens that has a focal length of 5.0 cm? Answer: _______________________________ 16. A laser is shined into a block of unknown material from air. The incident angle is measured to be 45 degrees and the refracted angle is 39 degrees. What is the index of refraction of the block of material? Answer: _______________________________ 17. Three students are attempting to measure the size of the gap in the grooves of a CD with lasers. One student is using a red laser, one a green laser, and one a blue laser. Which laser will experience the most diffraction because the wavelength is larger for the laser? Here is the direct link for the graph below. Select one: a. Red b. Blue c. Green 18. A light meter is measuring 10 lx when it is 40 cm away from a bulb. What will it be measuring when it is 20 cm away from the bulb? Answer: ________________________________ 19. Match up the incident ray with how the reflected ray would leave a concave mirror. Choose from… a. Out through the optical axis. b. Out through the focus. c. Out parallel to the optical axis. ____ A ray coming in parallel to the optical axis. ____ A ray coming in through the optical axis. ____ A ray coming in through the focus. 20. A physicist is pulled over. The officer states they had run a red light. The physicist responds that to them it appeared green because of the Doppler Shift. The police officers agrees and writes them a speeding ticket instead. For a red light to appear green was the physicist seeing it as they approached or in the rear view mirror as they moved away? And why? (Hint: Consider what happens to the length of the wavelength.) Select one: a. Approached - causes a shift to a higher frequency. b. Receded - caused the light to appear a lesser frequency. c. Receded - causes a shift to a higher frequency. d. Approached - caused the light to appear a lesser frequency.