1How is sound produced?
A sound wave is produced by a mechanically vibrating source in a medium. Its energy is transferred from one point to another without a transfer of medium
2Is a sound wave a transferse or longitudinal wave?
it is a type of longitudinal wave that travels parallel to the vibration of the medium.
3How is sound propogated when a prong vibrates outwards?
The layers of air are pushed close together, producing compression and rise in air pressure
4How is sound propogated when a prong vibrates inwards?
The layers of air are pulled apart, producing rarefaction and fall in air pressure.
5What is a compression?
It is a region where air pressure is higher than the surrrounding air pressure
6What is rarefaction?
It is a region where air pressure is lower than the surrounding air pressure
7How many compressions and rarefactions occur for a 20Hz
20 compressions and rarefactions in 1 second
8Can sound travel in a vacuum
No, it requires a medium to propagate
9What is the speed of sound in air, liquid and solid
air: 300-340m/s liquid: 1500-1600m/s solid: 5000-6000m/s
10Why does sound travel faster in more dense mediums such as solid?
Sound waves transfer energy through collisions of particles. Particles in solids are closely packled hence the rate of sound energy will be transfered faster compared to air and liquid
11What are the 2 factors that affect the speed of sound in the air
Temperature and humidity
12What is the formula for the speed of sound for an echo
2d/t with d = distance and t = time