For this discussion, you will research an aspect of sound waves and an associated technological application. You've been assigned a topic to research based on the first letter of your last name. See the table below: Discussion Assignments First Letter of your Last Name Topic Why does the speed of sound in air decrease as the altitude A-E above sea level increases? While traveling in the engine of a train, you are given the opportunity to activate the horn. How is the sound you hear F-L different someone near the tracks ahead of your train? How is the sound you hear different from someone in a car traveling next to the tracks at the same velocity? M-S What is a non-medical application of ultrasound? T-Z What is a non-medical application of infra-sound? Your initial post must conform to the following requirements: . You will construct an initial discussion post based upon the topic you've been assigned from the table above. . In addition to defining the concepts, you must illustrate them by applying them to an example. Your example must contain substantive details. . Support the information presented in your initial post with appropriate references. . Report what you've learned in your own words. Avoid plagiarism and the use of direct quotes. OLD W 10