Sound EOY notes Flashcards
What is sound?
Sound is a form of energy that is transformed from one point to another as a longitudinal wave.
How is sound produced?
Sound is produced by vibrating sources placed in a medium.
How does a sound wave travel?
All longitudinal waves travel as a series of compressions (C) and rarefactions
Compressions are regions where the medium’s density is higher than the surrounding density.
Rarefractions are regions where the medium’s density is lower than the surrounding density.
Can sound be transmitted through a vacuum?
No, sound cannot travel through a vacuum.
It needs a medium to travel from one point to another
How fast do sound travel?
Sounds travel at different speeds in different media.
How fast is sound in air?
Approximate speed of sound/ms-1: 300
How fast is sound in water?
Approximate speed of sound/ms-1: 1500
How fast is sound in Iron?
Approximate speed of sound/ms-1: 5000
How fast is sound in Granite?
Approximate speed of sound/ms-1:5400
Sound is fastest in a?
Solid
Sound is slowest in a?
gas
What are echoes?
An echo is the repetition of a sound due to the reflection of sound.
How are echoes formed?
An echo is formed when a sound is reflected off a hard, flat surface such as a large wall.
Echoes obey the laws of reflection
The angle of incidence i is equal to the angle of reflection r.
What are the uses of echoes?
Echoes can be used to measure large distances(like the depth of the sea); detect the location of objects ( Echolocation)
What is loudness?
Loudness is related to the amplitude of a sound wave.
The larger the amplitude, the louder the sound.
