Physics: Post your doubts here!

[Thought blocker]

Thought blocker why i can't open your profile and i can't start a convo with you? why did you do this to me

Bother, I am sorry I changed my settings, Now U can see to it...
I am so sorry

 

[Champ101]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s08_qp_4.pdf 11a ii

Its a frequency modulation, so there wont be any change in amplitude, just the frequency is affected.
Now, the carrier wave is modulated using the signal wave. The frequency shift produced by the signal is = 1.5 * 20 =30 KHz. So the limits of frequecy would be:
(500+30) and (500-30) which is 530 KHz and 470 KHz. And this variation is frequecy occurs 8000 times every second.

 

[boxfire1995]

can u draw a diagram and explain it to me please??????????

I can draw it but i dont know how to upload the picture. Its going to be an amplitude modulated wave with the peak point at around hundred and the carrier waves time period will be 20microseconds.

 

[Suchal Riaz]

Bother, I am sorry I changed my settings, Now U can see to it...
I am so sorry

no i can't

 

[boxfire1995]

Can someone please explain to me absorption line spectra and emission line spectra? Please

 

[Thought blocker]

no i can't

Now check it :/

 

[Batguy]

y does hydrogen provide evidence of descreetenergy levels

 

[daredevil]

A star I don't get that quesiton either!

is it even in our syllabus now?? bcz i think there were changes in the syllabus around 2007 so its better if u stick to questions and papers after that..

 

[Batguy]

y does hydrogen provide evidence of descreetenergy levels

???????? answer this

 

[A star]

y does hydrogen provide evidence of descreetenergy levels

rephrase this bro :3 is it from MRI? cause i remember doing this for chem :/

 

[Batguy]

rephrase this bro :3 is it from MRI? cause i remember doing this for chem :/

physics dude its how the line of spectrum of hydrogen provides evidence for the existence of the descreet electron energy level in atoms

 

[mehria]

A moving body undergoes uniform acceleration while travelling in a straight line between points
X, Y and Z. The distances XY and YZ are both 40 m. The time to travel from X to Y is 12 s and
from Y to Z is 6.0 s.

What is the acceleration of the body?

Ans is 0.37 ms-2

 

[A star]

physics dude its how the line of spectrum of hydrogen provides evidence for the existence of the descreet electron energy level in atoms

you really mixed up two concepts bro
yar the lines that form on the flourescent screen are dark seperate and have marked differenceswhich correspond to the wavelength of photons it absorbed.
(they for different bands , that are spaced)

 

[A star]

A star I don't get that quesiton either!

is it even in our syllabus now?? bcz i think there were changes in the syllabus around 2007 so its better if u stick to questions and papers after that..

it is and i never get these type of questions -_-

 

[A star]

answering so many questions on this thread doesn't give me right to post one extra post?

sorry bro no hard feeling .

 

[Batguy]

you really mixed up two concepts bro
yar the lines that form on the flourescent screen are dark seperate and have marked differenceswhich correspond to the wavelength of photons it absorbed.
(they for different bands , that are spaced)

its from past p[aper in marking scheem its written..
each line represents photons of specific energy....
photon emitted as a result of enery change of electron....
specific energy changes so descreet levels......<------its not clear enough just elaborate it......btw which two concepts :'(

 

[Champ101]

b

use a=-omega^2 x and omega-2pie/T

wtf?

 

[A star]

its from past p[aper in marking scheem its written..
each line represents photons of specific energy....
photon emitted as a result of enery change of electron....
specific energy changes so descreet levels......<------its not clear enough just elaborate it......btw which two concepts :'(

one in physics one in chem
yar they mean to explain the excitation and deexcitation of e-s
that part i wrote about responding to wavelength will do

 

[mehria]

use a=-omega^2 x and omega-2pie/T

 

[A star]

b


wtf?

kia hoa bhai this is the formulae for simple harmonic motion. if it cant be solved that way than its a mechanics question out of our course i guess