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Author Topic: Edexcel PHYSICS Doubts  (Read 141172 times)

Offline Saladin

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Edexcel PHYSICS Doubts
« on: May 08, 2010, 06:49:57 am »
Hey, post all your physics doubts here!

I do Edexcel AS Physics!
« Last Edit: May 08, 2010, 06:54:32 am by The Mysterious Dude »
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Offline 7ooD

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Re: Edexcel PHYSICS Doubts
« Reply #1 on: May 08, 2010, 03:02:34 pm »
how to calculate uncertanity of a given set of readings for example 14.2 14.7 and 15.1
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Offline break freak

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Re: Edexcel PHYSICS Doubts
« Reply #2 on: May 08, 2010, 03:18:00 pm »
Find their Range/2 & their precision, compare & choose the larger value:
Range/2=(15.1-14.2)/2              Precision=0.1
           =0.45
Therefore, %uncertainty= 0.5 (to 1 decimal place)  ;D
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Offline break freak

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Re: Edexcel PHYSICS Doubts
« Reply #3 on: May 08, 2010, 03:21:47 pm »
What is the answer for question 4 may 2009 Physics 3B with explanation plz ??? ??
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Offline 7ooD

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Re: Edexcel PHYSICS Doubts
« Reply #4 on: May 08, 2010, 03:45:23 pm »
how to get the Precision though??
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Offline 7ooD

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Re: Edexcel PHYSICS Doubts
« Reply #5 on: May 08, 2010, 03:47:40 pm »
look for the above question it should be D as they want to know the potential difference at which the diode will conduct and the arrangement is set so that the diode wont conduct electricity but when we apply a large p.d it will conduct 
« Last Edit: May 08, 2010, 03:51:07 pm by 7ood »
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Offline Saladin

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Re: Edexcel PHYSICS Doubts
« Reply #6 on: May 08, 2010, 03:56:42 pm »
Quote from: 7ood on May 08, 2010, 03:45:23 pm
how to get the Precision though??

This is what you have to do.

1. Find the mean
2. Then find the difference between the mean and the highest value
3. \frac{Difference between two values}{mean}*100
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Offline Saladin

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Re: Edexcel PHYSICS Doubts
« Reply #7 on: May 08, 2010, 03:57:32 pm »
Quote from: 7ood on May 08, 2010, 03:47:40 pm
look for the above question it should be D as they want to know the potential difference at which the diode will conduct and the arrangement is set so that the diode wont conduct electricity but when we apply a large p.d it will conduct 

I still dont know why this answer is right.
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Offline Darth Austrakast

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Re: Edexcel PHYSICS Doubts
« Reply #8 on: May 08, 2010, 04:05:09 pm »
here's a question i need help solving:
A student observes the diffraction of white light by holding a diffraction grating close to her eyes
a)draw a simple diagram to illustrate what the student observes
b) a tube of KMn04 solution is placed in front of white light source.Then the student views the filament through the solution with the grating close to her eyes. she notices that the blue, yellow and orange colors have vanished. Give an explanation.

Can you please help me asap? Thanks ! :)
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Offline Saladin

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Re: Edexcel PHYSICS Doubts
« Reply #9 on: May 08, 2010, 04:09:46 pm »
Quote from: Austrakast on May 08, 2010, 04:05:09 pm
here's a question i need help solving:
A student observes the diffraction of white light by holding a diffraction grating close to her eyes
a)draw a simple diagram to illustrate what the student observes
b) a tube of KMn04 solution is placed in front of white light source.Then the student views the filament through the solution with the grating close to her eyes. she notices that the blue, yellow and orange colors have vanished. Give an explanation.

Can you please help me asap? Thanks ! :)

What paper is this?
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Offline thisishard

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Re: Edexcel PHYSICS Doubts
« Reply #10 on: May 08, 2010, 04:22:26 pm »
where can i train for unit 3 physics other than the last 3 papers?
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Offline Saladin

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Re: Edexcel PHYSICS Doubts
« Reply #11 on: May 08, 2010, 04:23:54 pm »
Quote from: thisishard on May 08, 2010, 04:22:26 pm
where can i train for unit 3 physics other than the last 3 papers?

Try doing past IGCSE Physics paper 6.
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Offline Darth Austrakast

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Re: Edexcel PHYSICS Doubts
« Reply #12 on: May 08, 2010, 04:28:30 pm »
Quote from: The Mysterious Dude on May 08, 2010, 04:09:46 pm
What paper is this?

it was given in our school mock
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Offline Ascer Zayan

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Re: Edexcel PHYSICS Doubts
« Reply #13 on: May 10, 2010, 05:14:56 pm »
May june 2009
Question 6 Parts C and D

Dont Give me the Marking Scheme Answer Cuz i cnt understand them
And How can u find the uncertainty of a Length Which is only taken Once. ???
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Offline Ascer Zayan

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Re: Edexcel PHYSICS Doubts
« Reply #14 on: May 10, 2010, 05:19:11 pm »
Quote from: The Mysterious Dude on May 08, 2010, 03:56:42 pm
This is what you have to do.

1. Find the mean
2. Then find the difference between the mean and the highest value
3. \frac{Difference between two values}{mean}*100
i tried doing wat Mysteriouse dude said
But i got 2.95??
and wat is this 2.95%?
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