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Resonating bottles



Waves are everywhere. Sound, light, and even matter. They're what let us see the world around us, and what let us hear things (well, other than our eyes and ears respectively). Waves are what make sounds possible. When I was hanging out with a friend of mine the other day, in the middle of a conversation, he blew into the soda bottle he was holding and it made a noise. Being the physics enthusiast that I am, I decided to explain why that happens. Blowing into the bottle produces sound waves caused by air vibrating the bottle, and these waves have a different frequency. Frequency is what determines the pitch of a sound wave. The pitch can be changed by changing the frequency, which changes with either the wavelength, or speed of the waves. Blowing into a bottle of a different size will produce waves with different wavelength and frequencies, resulting in different pitches. In the case of a soda bottle, removing some of the soda will change the frequency as well. Since soda is a different medium than air, the speed of the wave will change in the same length resulting in a different frequency


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