Sound has a lot to do with waves because when something or someone makes a sound, that sound travels through the air making waves. All sound travels at the same speed depending on the temperature. If the temperature is higher, then the sound and speed are also higher. Sound waves are longitudinal waves and need a medium to go through. An echo is sound that hits the walls and comes back, which is why you hear it again and again and again.
Terms we went over today were refraction, natural frequency and resonance. Refraction is the changing of wave direction and speed due to the change in mediums. Mediums are always consistent. Natural frequency is the frequency an object will vibrate with after an external disturbance. These frequencies are usually discrete and depend only on the physical quantities of the object. Everything has a natural frequency depending on shape and material. For example, if someone is mad they're walk and tone would sound different than if they were calm.
Resonance is the increase in amplitude or oscillation or an electric or mechanical system exposed to a periodic external force whose frequency is equal to or some multiple of the natural frequency.
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| In the stadium, when people scream and holler, you can hear it echoing a little. This is because the stadium is shaped somewhat like a dome. In this shape, the sound is able to bounce around on the walls with no place to escape so that makes it echo. |
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