Physics question thread....

fatal

caesar wrote:

Put it into a song, sorry thats the best thing i could think of.

thats usually how i learn ALL my defininitions but for some reason this one I can NEVER remember

Rockerette

Polarisation... definition?? theres no clear one in the book...

thank you... in advance

fatal

Raphael wrote:

Right it out 10 times before you go into the exam. RIght it out again as soon as you open your answer book

now theres a plan...thanks

fatal

Rockerette wrote:

Polarisation... definition?? theres no clear one in the book...

thank you... in advance

polarisation is when a waves oscillations are confined to one plane ONLY

caesar

And only transverse waves can be polarised.

Raphael

Because longitudal ones don;t vibrate in a plane to begin with.

caesar

Raphael wrote:

Because longitudal ones don;t vibrate in a plane to begin with.

I know that too

Raphael

I just felt like adding something to continue the 2 post long sentence.

Rockerette

hehe thank you guys

Nichololas

Has anyone else used the Physics Workbook to help revise? Mine was blank because we didn't use it in school but I've just done 6 chapters in it and I find it quite effective.

whassupp2

Here are some q's i got stuck on. help wud be appreciated. thanks:

1 State the condition for 2 light sources to be coherent?
2 why are cds coloured?
3 what is meant by self induction?
4 give 2 practical uses of photoelectric device

whassupp2

Enlil_Nick wrote:

Has anyone else used the Physics Workbook to help revise? Mine was blank because we didn't use it in school but I've just done 6 chapters in it and I find it quite effective.

Nope. I think papers are much better than w/book because they cover more relevant stuff. w/book covers everything but is too broad and not exam orientated.

Nichololas

whassupp2 wrote:

Nope. I think papers are much better than w/book because they cover more relevant stuff. w/book covers everything but is too broad and not exam orientated.

Yes but now I know what a "transverse wave" is. :P

nedward

Mhm, OK, well, for two sources to be coherent, frequency and wavelength of waves emitted must be similar. They must be in phase or have a constant phase difference.

CDs are coloured because they have thousands of tiny dimples on their surfaces. These act as point sources. Interference occurs between the light emitted from these points, giving rise to the colours.

Self Induction is the induction of an emf in a coil with a core due to a changing magnetic field in the coil because of a changing electric current in the coil. By Lenz' Law its direction opposes the change creating it, reducing the forward current.

Photoelectric: Burglar alarm, counting items on a conveyor belt, film soundtrack.

whassupp2

nedward wrote:

Mhm, OK, well, for two sources to be coherent, frequency and wavelength of waves emitted must be similar. They must be in phase or have a constant phase difference.

CDs are coloured because they have thousands of tiny dimples on their surfaces. These act as point sources. Interference occurs between the light emitted from these points, giving rise to the colours.

Self Induction is the induction of an emf in a coil with a core due to a changing magnetic field in the coil because of a changing electric current in the coil.

Photoelectric: Burglar alarm, counting items on a conveyor belt, film soundtrack.

like the whole denis thing goin on there. thenx 4 da help. c ya 2morro

nedward

Best of luck.

whassupp2

same to you

whassupp2

Enlil_Nick wrote:

Yes but now I know what a "transverse wave" is. :P

Good for you. now try lookin at marking schemes. you'll learn alot more more quicklier.

:|

whassupp2 wrote:

Good for you. now try lookin at marking schemes. you'll learn alot more more quicklier.

hehe quicklier