Physics: Post your doubts here!

[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

 

[A star]

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

can you give the link of this question pls

 

[Champ101]

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

Bhai apne question sahi se bhi nai para

 

[mehria]

can you give the link of this question pls

http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_w10_qp_12.pdf

Q8

 

[A star]

Bhai apne question sahi se bhi nai para

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w10_qp_12.pdf

Q8

As hae phir theek hae

 

[mehria]

As hae phir theek hae

hahahaha cn u solve it??

 

[Thought blocker]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w10_qp_12.pdf

Q8

Use the equation of motion d = ut + 0.5at^2

equation 1 : 40 = 12u + 72a

equation 2 : 80 = 18u + 162a

[I added the distances, so that initial speed of both equations will be same]

now solve these simultaneously, and you will get 0.37 m/s^2 as the answer.