Can you hear me?

            On Friday we continued learning about waves! Of course we had a mini quiz to review what we had learned the day before… haha but nonetheless we continued learning. The theme of the day was SOUNNDDDDDD waves :)! We first went over reflection, refraction, and resonance! Reflection of waves happens when the waves bounce off an object. Refraction is the changes in wave direction based on the wave medium! Resonance is increase of amplitude of oscillation of an electric or mechanical system exposed to a periodical external force whose frequency is equal to or some multiple of the natural frequency. That was a long definition :P ! Natural frequencies depend on the physical being of the object so the frequencies change for different objects even if the object may be made of the same thing but the size is different. Resonance only occurs when you push the object at the right time.

            We also learned that sound waves are longitudinal waves which means they have areas of compression and rarefaction! But that also means they need a medium to go through. If we were in space you wouldn't hear us talking because there is no air, there is nothing for the sound waves to go through! The human range of hearing can go from 20Hz- 20,000Hz. But as we age we tend to lose our range of hearing. That’s why usually only young people can hear every mosquito ring tone when it is played. All sound travels the same speed IF they are at the same temperature. If the temperatures differ then the speed of sound differs. The hotter the temperature the faster sound travels. In room temperature sound travels 343 m/s. But light travels 300000000m/s !!! THAT IS FAST!

             Dance has been a part of my life ever since i was two. I never knew how important sound waves were. I have danced at different dance studios and some studios have sound boards that absorb the energy from the sound so that it doesn't cause echoing in the studio. I never noticed that and always thought that the board were for decoration but i guess if there weren't boards then the energy and the sound would be bouncing all around the studio and it wouldn't be productive.