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1. Phenomena Involving Sound Waves

2. Acoustics is the study of sound. Sound is a type of wave so it possesses several properties of wave. It also manifest several phenomena. Sound

3. When a sound wave reaches the end of its medium, or when it encounters an obstacle, it does not stop. A portion of the energy it carries is reflected off the obstacle that it encountered Some of the portions of the wave are absorbed Reflection of Sound

4. The Behavior of Sound Wave The reflection and the absorption of sound wave as it encounters a barrier.

5. The nature of the reflection of sound depends on the surface that the wave has interacted with. Sometimes, multiple echoes are heard from the sound of a speaker in an auditorium. Reflection of Sound

6. Too much echoes in an auditorium is caused by the surfaces being too smooth. Multiple reflections are being sent to many directions. This multiple sound reflection is referred to as reverberations. Reflection of Sound

7. The reflection of sound could also be a useful approximation of distance. Reflection of Sound

8. The speed of sound in air depends on temperature. However, air temperature is not always constant. Sound bends because of temperature differences in the air when the air near the ground is warmer than the air above, propagating sound waves bend away from the ground. This results in a sound that usually cannot be heard by a listener on the ground. Refraction of Sound

9. Refraction The refraction of sound as it travels in air.

10. Ultrasonic Imaging based on the principle of sound reflection. High-frequency sound waves called ultrasound are scanned over the body. After which, the echoes reflected off the internal organs are used to construct an image. Technology Involving Sound Waves

11. Ultrasonic Imaging An ultrasound image of a baby during prenatal examination.

12. Techniques used by dolphins and bats to locate distant objects around them. Echolocation

13. During a storm, you hear thunder 2.4 s after the flash of lightning. How far are you from where the lightning struck? Assume that the speed of sound in air is 343 m/s.

14. Step 1 : Identify what is required to find in the problem. You are asked to solve the distance between yourself and where the lightning struck. During a storm, you hear thunder 2.4 s after the flash of lightning. How far are you from where the lightning struck? Assume that the speed of sound in air is 343 m/s.

15. Step 2 : Identify the given in the problem. During a storm, you hear thunder 2.4 s after the flash of lightning. How far are you from where the lightning struck? Assume that the speed of sound in air is 343 m/s.

16. Step 3 : Write the working equation. During a storm, you hear thunder 2.4 s after the flash of lightning. How far are you from where the lightning struck? Assume that the speed of sound in air is 343 m/s.

17. Step 4 : Substitute the given. Step 5: Find the answer. During a storm, you hear thunder 2.4 s after the flash of lightning. How far are you from where the lightning struck? Assume that the speed of sound in air is 343 m/s.

18. Animals such as dolphins and bats use echolocation technique to interact with their surroundings. When a sound encounters an obstacle, some of its energy is absorbed, while some is reflected.The reflection of sound results in what we commonly call as echo. Multiple sound reflections are referred to as reverberations. 1 2 Some examples of technology involving sound waves include ultrasound imaging and sonar systems. 3

19. lightning strikes with no thunder heard sound produced on theater or cinema echoing of your voice through an empty hall changes in the speed of sound during daytime and night time capturing an image of a fetus on the mother’s womb using ultrasound Read and analyze the following situations given below. Write RL if it shows reflection of sound, and RC if it shows refraction.

20. Why is it that even with the use of microphone, it is hard to hear a sound in an open air location?

21. Hewitt, Paul G. 2010. Conceptual Physics (11th ed) . New York: Pearson Education. Laurel-Sotto, Rosario. 2005. Science in Today’s World Series. SIBS Publishing House, Inc. Young, H. and Freedman, R. 2008. Sears and Zemansky's University Physics ( with Modern Physics) (12th ed.). USA: Pearson Education.