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Author Topic: ALL PHYSICS DOUBTS - POST HERE !!  (Read 199480 times)

Offline MasterMath

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1395 on: May 25, 2010, 05:59:16 pm »
Quote from: ~VIN1094~ on May 25, 2010, 05:54:14 pm


black line is the Optical Axis .. green is parallel to it which converges .. am i right Master ??
Yeah anything parallel to The principle axis Deviates through the principal focus .. and Remember ANYTHING through the center of the lens ( int of y axis and x axis) PASSES through UNDeviated  ;)
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Offline MasterMath

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1396 on: May 25, 2010, 06:00:31 pm »
Thanks jelly :P , i know its bad though  ;)
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Offline Weaam

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1397 on: May 25, 2010, 06:12:54 pm »
Quote from: ~VIN1094~ on May 25, 2010, 05:50:28 pm
29) C .. always for ohmic conductors the graph is the way shown in the diag. Ohmic conductors are conductors that follow the ohms law .. ohms law states R=V/I .. V is directly proportional to I

THANK YOOOU!
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Offline guMnam

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1398 on: May 25, 2010, 06:13:57 pm »
Quote from: MasterMath on May 25, 2010, 05:59:16 pm
Yeah anything parallel to The principle axis Deviates through the principal focus .. and Remember ANYTHING through the center of the lens ( int of y axis and x axis) PASSES through UNDeviated  ;)
is optical focus and principle focus same thing???
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Offline Vin

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1399 on: May 25, 2010, 06:14:42 pm »
Quote from: weaam on May 25, 2010, 06:12:54 pm
THANK YOOOU!
welcome ..
got the other ones right ?? the resistance in a wire n stuff ??
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Offline Shazizzzle

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1400 on: May 25, 2010, 06:16:47 pm »
Has anyone considered answering MY question?!
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Offline diva_sparkles

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1401 on: May 25, 2010, 06:19:28 pm »
Quote from: guMnam on May 25, 2010, 06:13:57 pm
is optical focus and principle focus same thing???

yup!!
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Offline Vin

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1402 on: May 25, 2010, 06:20:27 pm »

Principal axis and Optical Axis are the same ..

Principle Focus : When rays of light are parallel to Principal axis they converge to form Principal Focus

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Offline omair

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1403 on: May 25, 2010, 06:25:22 pm »
i think now wat we must do at this monent
 1.revise notes or 2.pastpaper


besttttttt offff luckkkkkkkkk
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Offline NightHawkerr

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1404 on: May 25, 2010, 06:25:47 pm »
Can anyone tell me the basic points i need to know about the cathode ray tube? Because there seems to be questions about it in every past papers i've done, and i dont really understand it.
Thanks  :D
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Offline Ghost Of Highbury

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1405 on: May 25, 2010, 06:26:12 pm »
Quote from: Shazizzzle on May 25, 2010, 06:16:47 pm
Has anyone considered answering MY question?!

i cant open the paper,,
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Offline omair

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1406 on: May 25, 2010, 06:28:40 pm »
Quote from: NightHawkerr on May 25, 2010, 06:25:47 pm
Can anyone tell me the basic points i need to know about the cathode ray tube? Because there seems to be questions about it in every past papers i've done, and i dont really understand it.
Thanks  :D
dude remember how to find voltage that is voltage gain*amplitude

and timeperiod that is to multiply timebasewith wave lenth

also make sure u know how to find out y-plates are made more positive up or down to find out where ther beam deflects
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Offline Ivo

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1407 on: May 25, 2010, 06:29:52 pm »
Please can you see if the following is accurate, please also confirm that heat loss is due to increase of current.

Quote
The answer is A, because if thicker wires are used, resistance is less, so current is less, as voltage is constant (I=V/R).

In transformers, for the same power, voltage is increased and so current has decreased, so there is less heat (I=P/V).
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Offline Vin

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1408 on: May 25, 2010, 06:30:25 pm »
Quote from: Shazizzzle on May 25, 2010, 06:16:47 pm
Has anyone considered answering MY question?!

oh sorry i didnt see urs ..potential difference required for producing cathode rays is really high to produce high energy electrons .. also d.c. is required .. think about it .. u want to produce electrons from the cathode .. if its ac than cathode and anode would constantly be changing ;)
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Offline Ivo

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1409 on: May 25, 2010, 06:31:11 pm »
Quote from: ~VIN1094~ on May 25, 2010, 06:30:25 pm
oh sorry i didnt see urs ..potential difference required for producing cathode rays is really high to produce high energy electrons .. also d.c. is required .. think about it .. u want to produce electrons from the cathode .. if its ac than cathode and anode would constantly be changing ;)

FYI, the p.d. you stated is 600V.
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