Asg There are many kinds of waves that fall in the category of Electromagnetic Radiation. The most familiar of these is light. Others include radio waves, microwaves, and X-rays to name a few. In a vacuum all forms of Electromagnetic radiation travels at the speed of light. The speed of light is so important that it c = 3.0 x 10³ m/s gets its own letter assigned to it, 'c'. It is hard to wrap our minds around just how fast this is but the first problem on this problem set offers some semblance of comparison. 1. Before the advent of electronic timing, track meets were often started using a pistol firing blanks. Runners were trained to watch for the flash rather than listen for the sound. Lets see why. Consider a 100 Meter race. START a. If the starting gun is 100 m from the runners, how long will it take for the sound of the gun to reach the runners ears? d d=100m dev=d/t t=. += ? t= DA t:100/343 b. Using the speed of light above, how long will it take for the light flash to arrive at the runner's eyes. d=100m c. How far will the sound have travelled at the moment the light reaches the runners eyes? In other words, how far will the sound wave travel during the time the light takes to get from the gun to the runners eyes? d. Races are timed to the nearest millisecond. If one runner watches the flash of the gun and the other waits to hear the gun, how many milliseconds advantage will the flash watcher have? START MYISE
Asg There are many kinds of waves that fall in the category of Electromagnetic Radiation. The most familiar of these is light. Others include radio waves, microwaves, and X-rays to name a few. In a vacuum all forms of Electromagnetic radiation travels at the speed of light. The speed of light is so important that it c = 3.0 x 10³ m/s gets its own letter assigned to it, 'c'. It is hard to wrap our minds around just how fast this is but the first problem on this problem set offers some semblance of comparison. 1. Before the advent of electronic timing, track meets were often started using a pistol firing blanks. Runners were trained to watch for the flash rather than listen for the sound. Lets see why. Consider a 100 Meter race. START a. If the starting gun is 100 m from the runners, how long will it take for the sound of the gun to reach the runners ears? d d=100m dev=d/t t=. += ? t= DA t:100/343 b. Using the speed of light above, how long will it take for the light flash to arrive at the runner's eyes. d=100m c. How far will the sound have travelled at the moment the light reaches the runners eyes? In other words, how far will the sound wave travel during the time the light takes to get from the gun to the runners eyes? d. Races are timed to the nearest millisecond. If one runner watches the flash of the gun and the other waits to hear the gun, how many milliseconds advantage will the flash watcher have? START MYISE
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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