Does Crest = Compression (1 Viewer)

[zenger69]

I know this is yr11 prelim physics but over the holidays I wanted to do a bit of revising.

I was sent a physics syllabus summary of yr11 work.

And it said Compression = Trough and Rarefraction = Crest

When comparing longitudinal waves and transverse waves.

But I was taught the other way Compression = Crest and Rarefraction = Trough.

Where you just remember CC and it's all good.

Can someone confirm.

 

[FinalFantasy]

Compression corresponds to crest in transverse wave.
Rarefaction corresponds to trough in transverse wave.

 

[acmilan]

Compressions and rarefractions occur in longitudinal waves dont they?

 

[rama_v]

Compressions and rarefractions occur in longitudinal waves dont they?

Yes.... But a lot of the time sound waves are graphed similarly to transverse waves - they use pressure on the vertical scale and it so thats where you get the troughs and crests from which correspond to rarefactions and compressions.

 

[zenger69]

ok thanks. Just double checking.

 

[fwong]

Neither is correct. Compression and rarefaction are the midpoints between
compression and rarefction, depending when the particles move towards the
point or away from the point

Frederick

 

[dangerousdave]

Neither is correct. Compression and rarefaction are the midpoints between
compression and rarefction, depending when the particles move towards the
point or away from the point

Frederick

It depends if your trying to convert it into a displacement vs distance or air pressure vs distance.

 

[wanton-wonton]

Neither is correct. Compression and rarefaction are the midpoints between
compression and rarefction, depending when the particles move towards the
point or away from the point

Frederick

That's true, but not according to the syllabus. It clearly states the answer, trust me. Just look up this dot-point saying something along the lines of "identify that the crest of a blah blah is the same as a compression of a blah blah" or vice versa.

 

[xiao1985]

It depends if your trying to convert it into a displacement vs distance or air pressure vs distance.

agreed...

in alot of times, hsc /prelim syllabus are pretty bs...