Qualification > Sciences
Physics Help HERE ONLY !!
zara:
oh....igfab plzz use small font....
IGfab4:
--- Quote from: IGCSE nightmare on June 02, 2009, 01:48:01 pm ---I am wondering what should we draw when they ask us to draw a 'sound wave' with compressions and rarefactions?
should we draw wavefronts or what?
--- End quote ---
kk i'll also use smaller font but still not 10!! :D :D
for sound waves , i think we have to draw normal waves with the crests labelled compression and troughs named rarefaction :P
IGCSE nightmare:
Then the y-axis will be 'air pressure' ?! Isn't it?
Because I thought we can draw many waves close together naming them a compression and many other quite apart and name them a rarefaction?
IGfab4:
--- Quote from: IGCSE nightmare on June 02, 2009, 02:04:09 pm ---Then the y-axis will be 'air pressure' ?! Isn't it?
Because I thought we can draw many waves close together naming them a compression and many other quite apart and name them a rarefaction?
--- End quote ---
yeah, but the y-axis will be air pressure and labelled above normal, normal, and below normal. as high air pressure is caused by compression and low air pressure by rarefaction :D
idol2009:
The refractive index is sin i/sin r if I am not mistaken, so why in the Oct/Nov 08 paper 3 mark scheme is the answer to question 6b) sin r /sin i? I can't seem to understand, even though the answer looks wrong...
If anyone could explain to me that would be really helpful!
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