Sound Waves - Sound I - 3/4/18

Weekly Blog : Victor N. 8B

Image Location

Summary

Sound is a vibration of molecules that travels through air. Sound can make you see things differently. For example, one scene can have different background music and sounds, and can change the feeling of the scene. There are 2 types of sound waves, transverse waves and longitudinal waves. Transverse waves are vibrations that perpendicular to the direction of travel. Examples of transverse waves are water, string, and light waves. Longitudinal waves are vibrations that are parallel to the direction of travel. Examples of longitudinal waves is sound. Waves only transfer energy. To model sound, you can make a sound graph. There are 4 factors in a sound graph: the crest, the trough, amplitude, and wavelength. The crest is highest point of a wave and the trough is the lowest point of a wave. Wavelength, measured in meters, is the full cycle of a wave from 1 point to the next point. Frequency, measured in hertz (Hz) is the number of complete waves to pass a point every second. For instance, if 10 waves pass in 2 seconds, the frequency is 5 Hz. Speed can be calculated by using the formula: Frequency times Wavelength. Sound is heard, because the sound waves has vibrations. Those vibrations and waves transfer energy through the eardrum, which vibrates. When it vibrates, the hair cells vibrates which causes you to hear. In conclusion, sound can be produced by anything that vibrates, and can travel through air.

SP2 - Using Models

This week I used models to help me understand sound more. I used models when we did labs and activities on the topic. One of the labs that we did consisted of glass bottles, water, and pencils. My group and I were experimenting to see if the pitches and sound change depending on how much water is in the bottle. Another lab we did help us understand how sound is produced and traveled. Besides labs, graphs of sound waves helped me understand sound more. As you can see, I used models to help me understand sound more. 

XCC - Stability and Change

I noticed stability and change when learning about sound. When doing the glass bottle experiment aka the pop bottle music, there are some things you need to know that may affect the pitch of the bottle. The more water you add into a glass bottle, it creates a higher pitch when you blow across the top, and lower pitch when you tap the bottle. The less water you add into a glass bottle, it creates a lower pitch when you blow across the top, and higher pitch when you tap the bottle. This is because when you tap the bottle, the glass vibrates which affects the pitch of the sound. When you blow across the top, the air vibrates, not the glass. So when there is a little bit of water, there's a lot of air which create a lower pitch when it vibrates. As you can see, I noticed stability and change when learning about sound.

Multiplier - Learner

This week I was a learner, because I wanted to engage in the topic and learn more about sound waves.

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