A2 Physics | Post your doubts here

[ousamah112]

The question asks to show the final analogue signal. Because you people are showing the digital signal, so that's wrong. Convert the binary numbers to decimal numbers and join the points by making a curve.

not all the information is recovered when converted to analogue that's why it will not be a curve.

 

[Zishi]

Nopes...that's correct...check the application booklet

View attachment 9111​

Hmm, I am definitely wrong then. Thanks for the correction.

 

[ousamah112]

help me with may/june 09 p4 q6 part c..

 

[hassam]

The question asks to show the final analogue signal. Because you people are showing the digital signal, so that's wrong. Convert the binary numbers to decimal numbers and join the points by making a curve.[/quo
bro it is corrrect

 

[ninjas4life]

http://www.xtremepapers.com/papers/...nd AS Level/Physics (9702)/9702_w10_qp_42.pdf
can someone help me with Q2 b part(iii)??

 

[hassam]

For Q1 the primary charge is 1.6x10^-19 becase all the values are integral multiples of 1.6x10^-19
for Q2 b (ii) you have to substitute density=Nm/V into the equation given and get the value of <c^2>. do square root to get r.m.s. value.
the answer should be 500.

the problem is that all values are NOT integral multiples exactly !!!

 

[hassam]

help me with may/june 09 p4 q6 part c..

well see F=BIL......since B and L have not changed F is proportional to I.and F=mg......so m is proprtional to I since g is a constant.now the tricky part alternating current means it ll be changing direction so in one half reading will increase while for the other half it will decrease......so if i increase the current by a factor of sqrt(2) reading shud increase by the same factor,.......to make allowance for the reverse direction multiply 2.3sqrt(2) with 2

 

[hassam]

http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w10_qp_42.pdf
can someone help me with Q2 b part(iii)??

for p to q its simple p times delta v. for last part make use of the fact that total change in internal energy is ZERO.cos u end up at the same p v values from where u started.....alternatively u cud make use of the formula 3/2 pv (i.e internal energy of ideal gas)

 

[hassam]

well i have some doubts in communication chapter.........what has bandwidth to do with quality cos i always thought it has to do with the transmission capacity....if u have got high bandwidth u cn transmit more information.....bt books and ms says fm has greater bandwidth so greater quality........................
secondly one ms says for sky waves that poor reception in hilly areas......while question said why we made a switch from ionospheric reflection to space waves using satellites......now the doubt in my mind is that tthe space waves are of even shorter wavelengths so they are essentially line os sight,,,,isnt it

anyone????
State what is meant by the photoelectric effect?

 

[ninjas4life]

the problem is that all values are NOT integral multiples exactly !!!

yea the values are not exact but they are approximate. for example when you do (2nd value-1st value) you get a multiple of elementary charge.
i guess they only need approximate values

 

[ninjas4life]

for p to q its simple p times delta v. for last part make use of the fact that total change in internal energy is ZERO.cos u end up at the same p v values from where u started.....alternatively u cud make use of the formula 3/2 pv (i.e internal energy of ideal gas)

...so for the last change workdone should be -480 J and increase in internal energy is 0?
Thank You!

 

[hassam]

practice

 

[SkyPilotage]

anyone????
State what is meant by the photoelectric effect?

Photoelectric effect is the process where electrons are emitted from a cold metal surface when electromagnetic radiation of sufficient frequency falls on it.
It is used to show the particulate nature of particles / electrons...

 

[SkyPilotage]

In Remote Sensing (in the document I uploaded) you have everything you need - from page 14 to 26 I think

May you share the link for more?
Wow man, thank you for sharing! This is pretty cool!

 

[SkyPilotage]

I think this is the new one?
http://www.xtremepapers.com/papers/...sics (9702)/9702_Applications_Booklet_WEB.pdf
Updated October 2009!

 

[user]

I think this is the new one?
http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Physics (9702)/9702_Applications_Booklet_WEB.pdf
Updated October 2009!

yup it is!

 

[SkyPilotage]

Was that meant to be a joke?

Excuse me, I never knew about support booklets... Sorry...
Are there any more though?

 

[user]

Excuse me, I never knew about support booklets... Sorry...

oh...
no i didnt mean to hurt you I'm sorry!!!

So how did you study for applications?

 

[user]

Are there any more though?

Nopes..they are available just for the application part of the syllabus...

it's available for biology and chemistry too, if you take those subjects..

 

[SkyPilotage]

oh...
no i didnt mean to hurt you I'm sorry!!!

So how did you study for applications?

Now now, lets not get dramatical Im not hurt
Uhmm I have an endorsed Cambridge book, by David Sang , graham jones, richard woodside and gurinder chadha.