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The speed of sound in air is approximately 345 m/s (about 1250 kph, 770 mph, 1100 ft/s). The speed of sound in air is nearly the same for all frequencies and amplitudes. It increases with temperature.
Sound usually travels fast in gases, faster in liquids, and fastest in solids. The speed of sound in air increases with temperature. There are several formulas for calculating the speed of sound in air as a function of temperature. The speed of sound in air at 0 °C is 331 m/s; The speed of sound in air at 20 °C is 343 m/s
17 paź 2024 · A discussion of sound waves and their propagation can begin with an examination of a plane wave of a single frequency passing through the air. A plane wave is a wave that propagates through space as a plane, rather than as a sphere of increasing radius.
A speaker produces a sound wave by oscillating a cone, causing vibrations of air molecules. In Figure \(\PageIndex{2}\), a speaker vibrates at a constant frequency and amplitude, producing vibrations in the surrounding air molecules.
Sound waves in air (and any fluid medium) are longitudinal waves because particles of the medium through which the sound is transported vibrate parallel to the direction that the sound wave moves. A vibrating string can create longitudinal waves as depicted in the animation below.
the speed of sound in air is approximately 340 m/s; a high frequency sound wave has a high pitch; large amplitude sound waves are loud; reflected sound is called an echo
When an airplane flies at or above the speed of sound, air molecules cannot move out of the way of the airplane fast enough, so the pressure waves combine to generate a large shockwave, which people on the ground hear as a sonic boom.
