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.
Harp. 1  The harp, another stringed instrument, is nothing like the rest of the string family. It is a tall, triangular-shaped instrument with about 45 vertical strings. 2  The flute is a narrow metal tube about two feet long, with a row of holes covered by keys. (Early flutes were often made of wood.) The player blows air across the small hole in the mouthpiece to produce a sound that can be either soft and mellow or high and piercing. Like the violin, the flute may often carry the melody line as it is easy to hear above the other instruments. Piccolo The piccolo,usually made from metal or wood, is like a small flute.