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Author Topic: Edexcel PHYSICS Doubts  (Read 121382 times)

Offline Mike Benn

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Re: Edexcel PHYSICS Doubts
« Reply #480 on: May 05, 2011, 09:23:31 am »
hi guys...Can someone tell me the Key experiments for Unit 3 ....as me got exam on this 18th....Will be greatful
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Offline The Golden Girl =D

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Re: Edexcel PHYSICS Doubts
« Reply #481 on: May 05, 2011, 12:46:20 pm »
Quote from: Mike Benn on May 05, 2011, 09:23:31 am
hi guys...Can someone tell me the Key experiments for Unit 3 ....as me got exam on this 18th....Will be greatful

Finding :
Young-Modulus
Free fall
Viscosity


Those are the ones I've noticed they come a lot but I'll let you know if there's more that you should know iA ;)
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Offline s.shamo

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Re: Edexcel PHYSICS Doubts
« Reply #482 on: May 05, 2011, 07:04:53 pm »
Unit 3B January 2010
5. A student is doing an experiment to find the resistivity of constantan. His apparatus inclides a length of constantan wire, an ammeter, a voltmeter, a variable resistor and a micrometer.
(b)The student has been told to use a range of current valures to plot a graph of p.d against current.
(ii)Explain how plotting a graph should improve his results?


Help :(
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Offline EMO123

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Re: Edexcel PHYSICS Doubts
« Reply #483 on: May 05, 2011, 07:15:33 pm »
Quote from: s.shamo on May 05, 2011, 07:04:53 pm
Unit 3B January 2010
5. A student is doing an experiment to find the resistivity of constantan. His apparatus inclides a length of constantan wire, an ammeter, a voltmeter, a variable resistor and a micrometer.
(b)The student has been told to use a range of current valures to plot a graph of p.d against current.
(ii)Explain how plotting a graph should improve his results?


Help :(
sry but plz can i get the full paper link
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Offline s.shamo

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Re: Edexcel PHYSICS Doubts
« Reply #484 on: May 05, 2011, 08:00:02 pm »
Quote from: EMO123 on May 05, 2011, 07:15:33 pm
sry but plz can i get the full paper link

:/ I dont have one, but that's all that was written on the question paper regarding that question, no diagrans other than the cirut you had to draw.
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Offline The Golden Girl =D

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Re: Edexcel PHYSICS Doubts
« Reply #485 on: May 06, 2011, 07:23:07 am »
Quote from: s.shamo on May 05, 2011, 07:04:53 pm
Unit 3B January 2010
5. A student is doing an experiment to find the resistivity of constantan. His apparatus inclides a length of constantan wire, an ammeter, a voltmeter, a variable resistor and a micrometer.
(b)The student has been told to use a range of current valures to plot a graph of p.d against current.
(ii)Explain how plotting a graph should improve his results?


Help :(

The answer could be ;

That it would smooth out the readings*i.e. it would cancel the wrong readings*

I hope I helped :)

« Last Edit: May 06, 2011, 07:24:44 am by ~ The Golden Girl ~ »
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Offline narnia

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Re: Edexcel PHYSICS Doubts
« Reply #486 on: May 06, 2011, 09:49:49 pm »
Atoms which emit alpha or beta-particles usually emit gamma-rays as well. Explain why this
occurs ?


Historically, physicists found that electrons of low energy could not be used to find
out information about the nucleus of neutral atoms. Suggest why ?
« Last Edit: May 06, 2011, 10:01:35 pm by narnia »
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Offline Master_Key

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Re: Edexcel PHYSICS Doubts
« Reply #487 on: May 07, 2011, 07:47:11 am »
Quote from: narnia on May 06, 2011, 09:49:49 pm
Atoms which emit alpha or beta-particles usually emit gamma-rays as well. Explain why this
occurs ?


Historically, physicists found that electrons of low energy could not be used to find
out information about the nucleus of neutral atoms. Suggest why ?
They emit Gamma-rays in order to get stable. When they emit Alpha/beta they are in excited state so to return to its ground state the atoms emit radiation.

Low energy electrons are nearer to nucleus and thus is difficult to find information about nucleus. Hint:- Compare charges, velocity, mass, distance from nucleus and difficulty to trace them.
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Offline red_911

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Re: Edexcel PHYSICS Doubts
« Reply #488 on: May 07, 2011, 09:16:40 pm »
0.20 0.19 0.18 0.08 .. what is the best mean value ? and what is the uncertinity ? will we consider 0.08 when writing uncertinity ?
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Offline Arthur Bon Zavi

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Re: Edexcel PHYSICS Doubts
« Reply #489 on: May 08, 2011, 04:52:55 am »
Quote from: red_911 on May 07, 2011, 09:16:40 pm
0.20 0.19 0.18 0.08 .. what is the best mean value ? and what is the uncertinity ? will we consider 0.08 when writing uncertinity ?

Mean - 0.19

Uncertainity - 0.08 (42 %)
(42 % cannot be uncertainty)

Neglect 0.08 then. It will be alright. Take uncertainity of 0.01 (5%).
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Offline Ramprakash

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Re: Edexcel PHYSICS Doubts
« Reply #490 on: May 08, 2011, 06:54:10 am »
were there any unit 3 physics papers before the new syllabus started?if there were,can u give the paper code number and the source from u can get it?
thanks
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Offline The Golden Girl =D

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Re: Edexcel PHYSICS Doubts
« Reply #491 on: May 08, 2011, 06:55:55 pm »
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Offline Vampire-Love4ever

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Re: Edexcel PHYSICS Doubts
« Reply #492 on: May 08, 2011, 07:21:14 pm »
For those doing Unit 3B. Hope this will be of help!
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Offline Ramprakash

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Re: Edexcel PHYSICS Doubts
« Reply #493 on: May 09, 2011, 10:06:27 am »
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Offline Ramprakash

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Re: Edexcel PHYSICS Doubts
« Reply #494 on: May 09, 2011, 10:07:22 am »
Quote from: Vampire-Love4ever on May 08, 2011, 07:21:14 pm
For those doing Unit 3B. Hope this will be of help!
thank u very much
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