Video answer: Speed of sound | mechanical waves and sound | physics | khan academy
Top best answers to the question «Which would increase the speed of a sound wave»
Explanation: The most important factor influencing the speed of sound in air is temperature. The speed is proportional to the square root of the absolute temperature, giving an increase.
The more rigid (or less compressible) the medium, the faster the speed of sound. The greater the density of a medium, the slower the speed of sound. The speed of sound in air is low, because air is compressible.
Video answer: Wave speed equation - gcse physics