SOUND WAVES Flashcards
1
Q
Explain how sound waves are created.
A
By vibrations in a medium in the direction
of propagation. The vibrations cause a regular variation in pressure in the
medium.
2
Q
What type of wave is a sound wave?
A
longitudinal wave
3
Q
Explain the relationship between wave speed and the properties of the medium in which the wave travels (gas, liquid or solid)
A
Sound waves travel faster through solids, than through liquids and faster through liquids, than through air. This is due to the density of the mediums (the particles are closer together).
4
Q
What is an echo?
A
When waves hit a boundary they are reflected.
The reflection is different for different mediums.
5
Q
State the range of audible frequencies.
A
Between 20 Hz to 20 kHz
