The speed of sound is the distance travelled per unit time by a sound wave as it propagates through an elastic medium. In dry air at 20 Â°C (68 Â°F), the speed of sound is 343.2 metres per second (1,126 ft/s; 1,236 km/h; 768 mph; 667 kn), or a kilometre in 2.914 s or a mile in 4.689 s. The speed of sound in an ideal gas depends only on its temperature and composition. The speed has a weak dependence on frequency and pressure in ordinary air, deviating slightly from ideal behavior.
A flute is a musical instrument that produces sound when a stream of air is directed against the edge of a hole, causing the air within the body of the instrument to vibrate. Most flutes are tubular, but some are globular or other shapes.
These flutes were used during hunting and in magic rituals. Later on flutes are found which were made of wood or bamboo. All flutes used to have only holes. You could hold a flute to the left or right side and there were even flutes you could hold straight like a recorder.here came extra holes and keys on the flute to get rid of the fork fingerings. Around 1775 the flute had four keys: d sharp (already existed), b flat key, g sharp key and f key. Eventually more and more keys were added to the flute, but there still wasn't a good system for the keys.