A2 Physics | Post your doubts here

[user]

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.

oh that's fine then..no worries..

btw assalamoalaikum wr wb!

 

[SkyPilotage]

oh that's fine then..no worries..

btw assalamoalaikum wr wb!

oh , how can I top that salam. Then Ill just say the same wa-alykumessalam warahmatullah wabaraktuh!

 

[user]

oh , how can I top that salam. Then Ill just say the same wa-alykumessalam warahmatullah wabaraktuh!

that's actually the best way to say salam
i'm sure you remember that incident...of holy prophet peace be upon him

30 hasanat for saying this

 

[farrukh]

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

At greater frequencies, bandwidth is higher means more information can be carried per second. In case of FM, the quality increases because with higher bandwidths of FM, sounds of greater frequencies can be broadcasted. With the limited bandwidth of AM sounds of only about 4.5 KHz can be broadcasted. High quality music notes contain frequencies as high as 15 kHz so FM has better quality as these higher notes can be broadcasted..

 

[Abdullah syed]

rms speed at T= 300 is 500
to change rms speed into <c^2> square the rms speed
so twice rms means = 4<c^2>
we knw that <c^2> is directly proportional to T
so T1/T2= <c^2>/4<c^2>
put the values and you will get the answer.

Jazzakallah Bakhair
Thanks A lot Brother

 

[hassam]

well Explain why the circular motion of the conical pendulum has the same frequency as the simple
pendulum.

 

[farrukh]

Can someone pls answer the last part of Q4....exam style question in chadha's book...Chapter 24 capacitance??

 

[farrukh]

Why should optic fibres be as thin as possible?

 

[busy bee]

does anyone have short notes on electromagnetism and thermal physics ??

 

[hassam]

Why should optic fibres be as thin as possible?

to prevent multipath dispersion......thats just comes from the fact that a light beam has many rays and each ray will have to travel different distance

 

[hassam]

WELL this question suggest we must memorise that table in booklet

 

[user]

WELL this question suggest we must memorise that table in booklet

Aoa wr wb!




Btw, Which year question is this?

 

[hassam]

well o/n 04 telecommunication....chek this ppr must,.....quite tricky questions

 

[hassam]

tell frequency of info signal and unmodulated carrier wave

 

[user]

tell frequency of info signal and unmodulated carrier wave

is it 125000Hz for the info signal?

 

[hassam]

is it 125000Hz for the info signal?

wat abt carrier wave frequency.....info signal frequency is correct

 

[ousamah112]

plz explain wo9 p41 q 6 b i
and q7 b i n ii

 

[princesskt]

wat abt carrier wave frequency.....info signal frequency is correct

10 times more the signal one..............1250000

 

[ousamah112]

tell frequency of info signal and unmodulated carrier wave

is it 125000Hz for the info signal?

125oooo Hz for carrier frequency... btw how did you find frequency of signal wave???

 

[abdullah12]

How do we answer questions asking suggest why? Is there like a list of suggestions that we can memorize?