Sound.

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Presentation transcript:

Sound

What is the most common sound wave in your life? The Radio? Your Ipod? An Instrument? Your friends’ voices? Netflix?

VocaBULary we will learn today 1. Pitch: is how you hear and interpret its frequency Low Frequency: Low pitch (bass guitar) High Frequency: High pitch (whistle) 2. Decibels: this is how the loudness of sound is measured 3. Acoustics: the science and technology sound. 4. Supersonic: Objects that move faster than the speed of sound 5. Doppler effect: the shift in frequency caused by motion and it occurs when a sound source is moving below the speed of sound.

Properties of sound Sound is a wave. Therefore, it has frequencies associated with it. We can determine general frequencies by hearing pitch. Which has a higher frequency? A siren or thunder? How can we tell different people’s voices even if they are saying different things? Different voices have different MIXTURES of frequencies

The loudness of sound: Decibels The threshold for pain: 120 dB Acoustics: the science and technology of sound Places like libraries and recording studios must use acoustics to design areas that are quiet and do not magnify sound. Other places like theaters are designed to amplify sound. https://www.ted.com/talks/julian_treasure_why_architects_need_to_use_their _ears?language=en

Applying this to our classroom This is a loud class… How do you think the loudness effects your learning? Your energy level? Your ability to think? The louder the classroom, the harder YOU have to work to learn!

The speed of sound Sound moves in air at 343 meters per second (660 mph) Right at the shock wave when the amplitude changes all of a sudden… we hear a very loud sound… a sonic boom.

Speed of sound continued The speed of sound in liquids and solids is FASTER than the speed of sound in air. Why? More atoms with stronger bonds allow for faster travel. Air molecules are far apart. Solids and liquids are closer together.

The doppler effect If a sound producing object is not moving, everyone ears the same frequency. If the object is moving, people hear different frequency depending on if they are in front of it or behind it. http://m.esa.int/spaceinvideos/Videos/2014/07/Doppler_effect_-_classroom_demonstration_video_VP05

How sound affects us Hum the National Anthem with your hand on your throat. Hum in louder (higher amplitude) , higher frequency etc. What do you notice? No vocal Cords: http://neilatkin.com/2013/08/20/teaching-waves-and-sound/ 1. No vocal chords 2. Shatter a glass with your voice 3. The danger of vibrations: Tacoma Bridge 4. Using sound to control the elements! Water Video and Fire video