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ALL CIE PHYSICS DOUBTS HERE !!!

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TJ-56:

--- Quote from: $!$RatJumper$!$ on November 13, 2010, 08:05:21 pm ---WOW! :) Thank you so much! +rep

--- End quote ---

Sure ;)

thanx for ur answer, but just a question,
is Q always stationary at this point?

$!$RatJumper$!$:

--- Quote from: TJ-56 on November 13, 2010, 08:26:49 pm ---Sure ;)

thanx for ur answer, but just a question,
is Q always stationary at this point?

--- End quote ---

That is the exact question i asked my teacher when i learnt it but i forgot what he said :/ Perhaps you could check out this question and make a meaning from it? S07 Q23
Let me know :)

$!$RatJumper$!$:
Help with S09 Q29 and S08 Q26 please :)

TJ-56:

--- Quote from: $!$RatJumper$!$ on November 13, 2010, 08:56:27 pm ---Help with S09 Q29 and S08 Q26 please :)

--- End quote ---

So8 Q26

First you need to find the new intensity,
so I/I(new) = (1/r^2)/(1/(2r)^2)
Simplified, the new intensity is 0.25I
Now to find the new amplitude:
I/0.25I = (8^2)/(A[new]^2)
Simplified, the new amplitude would be root 16, which is 4 so D is the correct answer.
Hope that helped.

Dania:
Why is the answer A?

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