The TRANSMISSION of acoustic energy through a medium via a SOUND WAVE ... the Nine O'Clock Gun in Vancouver has been heard up to 45 miles away under the proper atmospheric conditions. Refraction of ...

When an object vibrates it produces a longitudinal wave which travels through air to your ear. For a sound to be heard you need three things: A vibrating object A material for the sound wave to ...

Sound vibrations leave the ... many times greater than the frequency of the audio wave. This signal will "carry" the audio signal over the air. An antenna picks up the the radio wave.

The speed of sound is the distance travelled per unit of time by a sound wave as it propagates through an elastic medium. At 20 °C (68 °F), the speed of sound in air is about 343 metres per second ...

Ears, on the other hand, act more like microphones, capturing sound through vibrations in the air ... using transmission-mode ...