1. The Reflection of Sound Waves the reflection of sound is a common occurrence as in water waves, sound waves reflect at the same angle in which they were transmitted

2. The reflection of sound waves is an important part of certain concepts: 1. Echoes - produced when a sound wave is reflected off a hard surface - time interval must be greater than 0.1 s between the original sound and the reflected sound, and the observer must be greater than 17m from the reflecting surface - echolocation boyecholocation boy - Chitzen Itza, MexicoChitzen Itza, Mexico 2. Sonar - acronym for sound navigation and ranging devices - short pulses of sound is emitted underwater, the time it takes to return (echo) is measured and using the speed of sound in water, the distance is calculated - sonar ruler appsonar ruler app

3. Example A ship sends out a pulse that returns from the floor of the sea in 3.42 s. If the speed of sound through salt water is 1531 m/s, what is the distance to the bottom of the sea? v = 1531 m/s t = 3.42 s d = ? d = vt = (1531)(3.42) = 5236.02 distance ÷ 2 = 2618.01 The distance to the bottom of the sea is 2 620 m. 7.6 Prac. #1-4 UC #1-3