Forbidden. said:
i knew waves were gonna be a bugger.
i havent started any yet
.
will start tonight and continue tomorrow till test 2 and test 1R begins.
we didn't do waves until physics 1b last year, anyway...
the most important thing to understand is the interference between 2 waves.
basically what you do is look at the path length difference between 2 waves, then work out the number of wavelengths that path length difference is equivalent to, then you can work out a phase difference (simply by multiplying by 2pi)
From the phase difference you can work out whether the interference is going to be constructive or destructive.
It is also useful to know how to go the other way - ie how to go from a phase difference to a path length difference between 2 waves.
Once you can do this, you should be able to solve most of the questions relating to light waves such as those on twin slit interference, single slit diffraction, newton's rings and thin film interference as well as some sound/mechanical waves questions.
obviously you still need to learn other stuff, but this is the most important thing to understand imo.
if you are stuck on any questions feel free to post them up.
good luck for your exams!