00:01
Okay, so in this, we need to choose the statements which correctly describe the properties of sound wave.
00:05
So five statements, effectively are they true or false? so statement number one, the sound wave in air is a longitudinal wave of compression and rare a fraction of air molecules.
00:15
That is absolutely true.
00:18
So compressions are areas of higher pressure where the air molecules close together.
00:23
Rarifactions are areas of lower pressure where the air molecules are further apart.
00:27
And they pass the energy along by vibrating and knocking into their neighbours.
00:37
For statement two, the transverse component of sound wave in air travels slower than the longitudinal component of a sound wave and air.
00:43
That is false.
00:46
Sound waves are longitudinal.
00:48
They don't have a transverse component.
00:53
Statement three, sound wave is a mechanical movement of molecules through the air propagating from the source of the wave.
00:58
So in this scenario, it sounds like it could be true.
01:03
It seems to take a lot of the boxes.
01:05
However, to me, this appears to say that what carries the sound is not air molecules knocking into their neighbours and passing the energy along.
01:14
This is air molecules, or effectively emanating from the source of the sound, and those air molecules travel through the room...