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A2 Physics | Post your doubts here

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It is when the carrier wave frequency is modulated according to the displacement of the signal wave. Am I right?
i got it as ...f of carrier waves varies in (synchrony ) with signal in (synchrony) with displacement of signal...
but i want a simple and correct defination:)
 
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First things first: Dear Moderators,
I have been facing difficulty when it comes to finding A2 posts at the threads you have so kindly created for a more organized look. However, I wanted to see a separate thread for A2 questions and A2 questions alone. So, I came up with this thread.
Truth be told, A2 is very different from AS and the queries related to them are entirely different since there are different topics involved. I hope you understand.

My first A2 question: Can anybody please explain to me what 'infinite input impedance' means?

The pd across the input terminal is high and the current is low..
 
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June 2009 P4 Q2 a) :- Why is the rate of alpha particles seem constant?
Answer in markscheme:- half life is very long/ but when I calculate half life by ln2 / decay constant its very shoort 1.98 x19^-7...
Am I missing something? I think I am, the constant rate is Delta N / Delta t not the decay constant right?
 
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in 9s very little decay of barium..since its half life is 1080s...
for Kr in zero second its no. is x...wen it becomes half in 3s it becomes x/2..in 6s its x/4..in 9s its x/8...
so from ratio ba/kr...x/(x/8)=8...
hope u get it:)

Thank you!!
Was Struggling a lot with this question..:)
 
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