Need help with waves!!

[Aodian]

I've got all the basics like what exactly is a standing wave, transverse and etc etc as well as all the lingo. But I just don't get what they want when they're talking about In phase or out of phase. I pretty much don't understand phase difference at all. Also could someone help in explaining diffraction gratings. I'm fed up with my teacher spending 40 minutes of the class talking about how great he is and how he's managed to somehow add 1412 people on facebook over the weekend. Whilst leaving us 20 minutes of real lesson. HELP please. I'm desperate!

[Q80BOY]

I've got all the basics like what exactly is a standing wave, transverse and etc etc as well as all the lingo. But I just don't get what they want when they're talking about In phase or out of phase. I pretty much don't understand phase difference at all. Also could someone help in explaining diffraction gratings. I'm fed up with my teacher spending 40 minutes of the class talking about how great he is and how he's managed to somehow add 1412 people on facebook over the weekend. Whilst leaving us 20 minutes of real lesson. HELP please. I'm desperate!

lol at the facebook teacher .. i got a similar one but he "teaches" AS Chemistry

anyways .. you can always make use of Mr. Paul here (astar) .. so ask questions and stuff .. also check out his physics notes on waves from his website

http://www.astarmathsandphysics.com/a_level_physics_notes/a_level_physics_notes_waves_and_oscillations_menu.html

good luck!

[astarmathsandphysics]

In to my website then click igcse physics notes then waves