Physics IGCSE HELPPPPPPPPPPP

[allysaleemally]

hey guys can u please help me on phy paper 3 oct 2002 question 5
http://www.xtremepapers.me/CIE/Cambridg ... 2_qp_3.pdf

i cant understand what is a rarefraction and a compression?
can u help?

thanks

 

[unplugged]

A compression is when you decrease the space something is in (compress them) and rarefaction NOT refraction, is when you increase the space something is in(decompress ).
Longitudinal waves are a series of compressions and rarefactions as you see in the picture. And since he noted on the axis that as you go up compression increases and as you go down compression decreases , the compression is up and the rarefaction is down.

And a wave length is a distance between two rarefactions or two compressions so the distance he's referring to (between a rarefaction and a compression) is half a wave length.

 

[Lenny Mai]

Hi,
I am in deep sht for the moment in Physics! Does anyone have Physics notes urgently please!! This would save my life! Only IGCSE...
thanks

 

[sweetiepie]

HERE CHECK THE WHOLE POST PROPERLY
http://www.xtremepapers.com/community/threads/useful-stuff-compiled.10273/