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ALL CIE PHYSICS DOUBTS HERE !!!

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Deadly_king:

--- Quote from: $!$RatJumper$!$ on November 06, 2010, 08:32:00 am ---What is the difference between the equations:

D*n*(lambda) / d

D*(lambda) / d

--- End quote ---

D(lambda)/d : It is the distance between the centres of two consecutive bright fringes or the distance between the centres of two consecutive dark fringes.

Dn(lamda)/d : It is the distance between the centres of two bright fringes which separated by n wavelengths or the distance between the centres of two dark fringes which are separated by n wavelengths.

But am not sure about the second one since it is only rarely used. :-[

Dania:

--- Quote from: Deadly_king on November 06, 2010, 10:05:10 am ---Am sorry but I don't have a scanner :-[

Nevertheless I'll see what i can do for you.

--- End quote ---

You could take a picture with your phone, it doesn't have to be immaculate.

Dania:
Help!
The mark scheme answer is so vague. I don't get it.

TJ-56:

--- Quote from: Deadly_king on November 06, 2010, 06:14:06 am ---Nov 03 p2

3.(c)(i) In both strings the tension is directed towards the pulley. But I don't know how to explain it. :-[

5.(c) Hmm...........first you should realize that it is a graph of velocity against distance from A.

Hence the gradient will be velocity/distance which is also equal to 1/time.

Therefore as the electron moves from A to B, time is increasing.

Since gradient = 1/time, an increase in time will lead to a decrease in gradient.

But velocity of the electron will be increasing due to the force of attraction from plate B and the force of repulsion from plate A.

Thus the graph should indicate an increase in speed while the gradient will be decreasing. This is why a curve is drawn instead of a straight line. ;)

Hope it helps :)


--- End quote ---
Thanx for the help!
+rep

Hypernova:

--- Quote from: Dania on November 06, 2010, 09:45:21 am ---Do you mind drawing it out for me and uploading the pic? I get what you're saying. But I'm finding it hard to draw it. Thanks.

--- End quote ---

Here.

<a href="http://tinypic.com?ref=2wpqs09" target="_blank"><img src="http://i51.tinypic.com/2wpqs09.jpg" border="0" alt="Image and video hosting by TinyPic">[/url]

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