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Author Topic: ALL PHYSICS DOUBTS - POST HERE !!  (Read 225523 times)

Offline Syed Kazim

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2250 on: May 26, 2010, 10:12:36 pm »
Quote from: diva_sparkles on May 26, 2010, 10:10:08 pm
sory 2 say but an increase in length increases resistance

Oops. Sorry, I'll edit that.  :-[

Done.
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Offline diva_sparkles

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2251 on: May 26, 2010, 10:13:49 pm »
Quote from: NightHawkerr on May 26, 2010, 10:10:46 pm
Can somebody tell me what to study for the CRO for tomorrow's exam? I mean I know how to label and stuff, but then they get too complicated! HELP! ???

can u ask frm a specific pastpaper tht will be easier 2 explain?
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Offline Vin

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2252 on: May 26, 2010, 10:13:57 pm »
Quote from: Baladya on May 26, 2010, 10:09:23 pm
k thx all :P Vin plz stay alive for tommorow :D xD jk :P but plz help tommorow :P

haha LOL .. i wont die without helping u :P
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Offline NightHawkerr

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2253 on: May 26, 2010, 10:15:19 pm »
umm O/N 2001 Q 9.
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Offline Baladya

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2254 on: May 26, 2010, 10:16:20 pm »
Quote from: NightHawkerr on May 26, 2010, 10:10:46 pm
Can somebody tell me what to study for the CRO for tomorrow's exam? I mean I know how to label and stuff, but then they get too complicated! HELP! ???

Cathode is heated and shoots electrons at high speed (and energy). It is the thing on the left. Then the anode atracts the electron and makes the electron pass through a gap in it. Then u've got the y-plates which move the electron up and down by + and -plates .(postitive attracts electron, negative deflects it. X-plates same thing but left and right. Then there is a Fluorescent screen which gives light when the electron hit it. A time-based circuit is connected to X-plates to move the dot (the dot shown on the screen) left to right at a constant speeed and then returns it very quickly to the start.
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Offline Syed Kazim

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2255 on: May 26, 2010, 10:17:13 pm »
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Offline Baladya

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2256 on: May 26, 2010, 10:17:46 pm »
A voltmeter ( i think it was a voltmeter. dont remember exactly :P but has to do with volts :P) is attached to the y-plates
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Offline NightHawkerr

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2257 on: May 26, 2010, 10:18:01 pm »
Quote from: Baladya on May 26, 2010, 10:16:20 pm
Cathode is heated and shoots electrons at high speed (and energy). It is the thing on the left. Then the anode atracts the electron and makes the electron pass through a gap in it. Then u've got the y-plates which move the electron up and down by + and -plates .(postitive attracts electron, negative deflects it. X-plates same thing but left and right. Then there is a Fluorescent screen which gives light when the electron hit it. A time-based circuit is connected to X-plates to move the dot (the dot shown on the screen) left to right at a constant speeed and then returns it very quickly to the start.

hm, quite confusing, but thanks so much!  :)
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Offline Malak

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2258 on: May 26, 2010, 10:18:56 pm »
Anyone ??

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Offline Baladya

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2259 on: May 26, 2010, 10:19:15 pm »
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Offline diva_sparkles

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2260 on: May 26, 2010, 10:19:29 pm »
Quote from: Baladya on May 26, 2010, 10:17:46 pm
A voltmeter ( i think it was a voltmeter. dont remember exactly :P but has to do with volts :P) is attached to the y-plates

yup thts correct! :)
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Offline Syed Kazim

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2261 on: May 26, 2010, 10:22:24 pm »
Quote from: ang3l on May 26, 2010, 10:18:56 pm
Anyone ??






ALPHA: stopped by paper
BETA: goes through paper, stopped by thin metal (aluminium)
GAMMA: goes through paper and metal sheet. Stopped by thick lead or concrete.

Credit: Took it from gcse.com

EDIT: If the image is too small, click here.

EDIT 2: In the exam you will have to draw a source on one side of the aluminium sheet and a count-meter on the other.
« Last Edit: May 26, 2010, 10:27:04 pm by Syed Kazim »
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Offline red_911

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2262 on: May 26, 2010, 10:26:28 pm »
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Offline diva_sparkles

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2263 on: May 26, 2010, 10:27:39 pm »
Quote from: red_911 on May 26, 2010, 10:26:28 pm
which year is it ?

i think it's solved
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Offline Baladya

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2264 on: May 26, 2010, 10:27:50 pm »
guys remember. If they bring a magnetic field and tell u how will it be deflected, use Fleming's Left-Hand rule. BUT REMEMBER. U have to point ur middle finger the in the other direction (not the direction of electron, point it to the cathode not the fluorescent screen. Cuz of the conventional current
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