10. Which of the following can use echoes to determine the distance to an object? illuminance on the book is 22 1x? What is the distance of a book from a lamp that produces 1750 im of flux when the ships using sonar bats all of the above cameras 10. 1. When considering sound quality in musical terms, the difference between two waves with the tone color, or tone quality. 14. same pitch but different combinations of harmonics is called oscillator pitch timbre shape 11. For problem #12, write true or rewrite the italicized part to make the statement true 12. Sound can travel through a vacuum . 13. A light bulb is 4.1 m from a surface. How much luminous flux must the bulb produce if the illuminance required is 22 Ix? 15. A 100-percent-efficient lightbulb outputs 510 Im of luminous flux for each watt of power it uses. What is the illuminance on a book due to a fluorescent bulb that is 2.0 m from the book that uses 40 W of electric power? Assume that the bulb operates at 20 percent efficiency. In other words, only 0.2 of each watt of electric power provided to the bulb is converted to watts of usable electromagnetic energy in the form of light. (Hint: calculate luminous flux first.)