The speed of sound is the distance travelled per unit of time by a sound wave as it propagates through an elastic medium. More simply, the speed of sound is how fast vibrations travel. At 20 °C (68 °F), the speed of sound in air, is about 343 m/s (1,125 ft/s; 1,235 km/h; 767 mph; 667 kn), or 1 km in 2.91 s or one mile in 4.69 s.

2024年11月2日 · Learn about how to measure the speed of sound in air for your IGCSE Physics exam. This revision note includes two methods for measuring the speed of sound in air.

2023年2月2日 · Measure the speed of sound with a smartphone with one of these seven exciting experiments. Discover how to use an acoustic stopwatch, wave interference or the frequency of an Helmholtz resonator to calculate the speed of sound. Activities aligned with school cursus for students in middle or high school.

In this virtual investigation you will find the speed of sound in solids, liquids, and gases. You will fill a tube with a chosen material and send sound from a tuning fork through the tube. A detector will pick up the sound at the other end of the tube and show you the speed of sound in that material.

2024年7月25日 · Check with our speed of sound calculator how the speed of sound in water or air changes with temperature.

2025年1月26日 · Speed of sound is the distance travelled per unit of time by a sound wave as it propagates through an elastic medium. Learn its formula, factors affecting, examples English

Speed = distance ÷ time. Watch the video to see how you can measure the speed of sound in air:

In National 4 Physics learn how to find the speed of sound, how it’s related to its frequency and wavelength, and how ultrasound waves are used in medicine.

Sound, like all waves, travels at a certain speed and has the properties of frequency and wavelength. You can observe direct evidence of the speed of sound while watching a fireworks display (Figure 17.3.1).

Students should be able to obtain an estimate for the speed of sound of between 300 and 400 ms -1. Echoes can cause erroneous readings. Students could try to identify sources of possible echoes and eliminate them, change location or increase the threshold on the acoustic stopwatch if this proves to be an issue.