A2 Physics P4 Questions ONLY

[scouserlfc]

How will i explain it when they ask us about discrete energy levels? I know that photons with certain energies are emitted and the energy difference corresponds to the energy of a particular photon but how will i explain it all? I dont know how to phrase my answer

Same problem here as well. Normally the ms says that difference in the energy levels is discrete as u only have a few lines in the emission spectra so they say that this implies that energy levels are discrete !

 

[boxfire1995]

Same problem here as well. Normally the ms says that difference in the energy levels is discrete as u only have a few lines in the emission spectra so they say that this implies that energy levels are discrete !

Oh. Thanks. Hows prep for tomorrow?

 

[saadgujjar]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s06_qp_4.pdf
q4a and c part plz
q6a
q7a plz explain

explain plzz

 

[boxfire1995]

I know I know i was trying to have some fun but i ended up screwing my post so it now sounds as if im a total and complete idiot who doesnt know what an alpha particle is

Hahaha. You scared me for a second.

 

[scouserlfc]

Hahaha. You scared me for a second.

How did i scare you ??

 

[scouserlfc]

Oh. Thanks. Hows prep for tomorrow?

Pretty good for all topics ALHUMDULILLAH. but sometimes i mess up thermal physics or electromagnetic induction so trying to paper these cracks at the moment

 

[boxfire1995]

explain plzz

The angular velocity 'w' is same for both, so when one complete rotation of the wheel takes place, one complete cycle of the piston occurs. So the answer is one.
ii) well, 2400 in 60s so in 1s how many revolutions will it make? Use the unitary method and get the answer.
Bi) v= omega*amplitude since they have asked for the maximum speed.
Ii) well, a=w2x. And since they have asked for max acceleration, use maximum amplitude.

 

[boxfire1995]

How did i scare you ??

Youre smart, and when you asked that question i thought i had it all wrong, i started rechecking my calculation.

 

[axetreme.O]

Okay so lets define the terms n and N .
n is the number of moles of the substance.
N is the number total gas molecules.

If u have taken chemistry or even had it in O Levels u would know this formula .
Number of molecules = moles * Avogadros constant

So make Avogadros constant the subject and u get that n/N .

Auoowww...

 

[scouserlfc]

Auoowww...

Whats the problem ?? Please let me know so ill solve it !

 

[saadgujjar]

The angular velocity 'w' is same for both, so when one complete rotation of the wheel takes place, one complete cycle of the piston occurs. So the answer is one.
ii) well, 2400 in 60s so in 1s how many revolutions will it make? Use the unitary method and get the answer.
Bi) v= omega*amplitude since they have asked for the maximum speed.
Ii) well, a=w2x. And since they have asked for max acceleration, use maximum amplitude.

other question???

 

[unique111]

http://papers.xtremepapers.com/CIE/...and AS Level/Physics (9702)/9702_s06_qp_4.pdf
Ques 1c ii?
2bii?