Qualification > Queries
ANY DOUBTS HERE!!!
halosh92:
could anyone plz explain to me wat i have to know exactly in the potenital energy anf kinetic energy for AS level physics cie.
ijust dont get it.are there any rules for it???
nid404:
--- Quote from: Sue T on May 05, 2010, 04:01:34 pm ---i need some help with 5 (b) pls (question attached)
--- End quote ---
I've answered this before...wait i'll get you the link
moon:
--- Quote from: moon on May 06, 2010, 02:11:42 am ---please I need help in specimen 6BIO2 Q4c.
--- End quote ---
nobody studies edexcel except me here ??? ???
nid404:
--- Quote from: Sue T on May 05, 2010, 04:01:34 pm ---i need some help with 5 (b) pls (question attached)
--- End quote ---
there is a formula u need to know
phase difference=( 2pi/ lamda) X path difference
phase difference = pi [ for destructive interference]
lambda(wavelength) = 2pi/ pi X path difference.
path difference is S2M - S1M
find S2M using Pythagoras = root of 802 + 1002
=128
path difference= 128-100=28
wavelength= 2pi/pi X 28
=56cm
At f= 1KHz wavelength= 0.33m/ 33cm
At f=4kHz wavelength= 0..0825/8.25cm
wavelength changes from 33cm to 8.25cm
for minima...phase difference should be either one of them pi, 3pi,5pi,7pi [sub them in the eqn]
minima is observed when lambda= 56cm, 18.7cm, 11.2cm, 8cm
which are the 2 values between 33 and 8.25?? 18.7 and 11.2...so only 2 minimas
Dr.Black Knight:
--- Quote from: moon on May 06, 2010, 01:29:42 pm ---nobody studies edexcel except me here ??? ???
--- End quote ---
I too do edexcel
Does anyone have the core practicals for bio 1 and 2 I'm doing the alternative to practicals!!1
And for phy6!!!
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