OLevel Physics Lens Question, please answer quickly!! :(

[FLRNAB]

On the contrary, I find this a much shorter answer. And easier to demonstrate via a diagram. Plus, it MAKES SENSE TO ME

Everybody is different.

Mainay kia karna hai ?

Aqal istamaal krni hai bhai meray.

 

[Faizan Muhammmad]

Everybody is different.


Aqal istamaal krni hai bhai meray.

kaar to dee hai :

for that first part all you have to do is put it such that sun's image is formed on screen
it will be focused at 15 cm
that is it

 

[Anonymous321]

for that first part all you have to do is put it such that sun's image is formed on screen
it will be focused at 15 cm
that is it

Thankyou, captain obvious.

 

[Faizan Muhammmad]

Thankyou, captain obvious.

you are most welcome

 

[Anonymous321]

another question about ATP, plis?

Is it some universal law that we only use metre values in formulas

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Physics (5054)/5054_w10_qp_41.pdf

Q1.c (iii) They've given us a formula to calculate something from values obtained from previous answers. But they haven't specified which unit to use (cm or m)?
Even though in the previous part (in which we obtained that value), they are accepting BOTH cm and m....

Also where would we place the eye in 1(a) (ii). the marking scheme is vague about this :|

 

[FLRNAB]

another question about ATP, plis?

Is it some universal law that we only use metre values in formulas

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Physics (5054)/5054_w10_qp_41.pdf

Q1.c (iii) They've given us a formula to calculate something from values obtained from previous answers. But they haven't specified which unit to use (cm or m)?
Even though in the previous part (in which we obtained that value), they are accepting BOTH cm and m....

Also where would we place the eye in 1(a) (ii). the marking scheme is vague about this :|

You use cm just like you use data from previous answers. Look at the table and question statement. They are using cm.

Perpendicular to the dotted line. Make sure your ruler is longer than h0

 

[Anonymous321]

You use cm just like you use data from previous answers. Look at the table and question statement. They are using cm.

Perpendicular to the dotted line. Make sure your ruler is longer than h0

But the answer to the formula wala question in the marking scheme - it's based on metres! I used cm in MY answer and my value was more, by a power of 10, than the answer in the marking scheme. :| I know it's perpendicular to the scale, but would it at the TOP or BOTTOM of the line? top, right?

''Make sure your ruler is longer than h0'' Is ka kya matlab?

 

[FLRNAB]

But the answer to the formula wala question in the marking scheme - it's based on metres! I used cm in MY answer and my value was more, by a power of 10, than the answer in the marking scheme. :| I know it's perpendicular to the scale, but would it at the TOP or BOTTOM of the line? top, right?

''Make sure your ruler is longer than h0'' Is ka kya matlab?

Longer than Hzero

Top Line.

It says ecf = easy carry forward. You show your working you get the marks according to that. 11.6 is for meters but it does not say cao (correct answer only) for part 3 but only for part 2 so your answer would also be accepted.

 

[Anonymous321]

Longer than Hzero

Top Line.
It says ecf = easy carry forward. You show your working you get the marks according to that. 11.6 is for meters but it does not say cao (correct answer only) for part 3 but only for part 2 so your answer would also be accepted.

i know u meant H zero, but my ruler being bigger than H zero?? You mean my EYE should be above H0?
So I scored 26, not 25, yayy!! .

 

[FLRNAB]

i know u meant H zero, but my ruler being bigger than H zero?? You mean my EYE should be above H0?
So I scored 26, not 25, yayy!! .

Yes because if ruler is of length Hzero then you don't get the proper reading because there is unknown length between edge of ruler and zero mark and edge of ruler and end mark (15 cm, 30 cm etc)

Ruler should be longer than what is being measured because it makes it easy to take the reading.

No it should be at Hzero or generally it is at the place where the reading is. Thermometer py jahan liquid hoga wohi prhen gay to when py eye rkhni hogi.

Hope you understand by desi lang.

 

[Anonymous321]

Off course, But isn't it a given that we're using a metre rule,100 cm, while H0 is 75.5 cm. We don't have to state that in the question
That IS what you meant right?

 

[Anonymous321]

-describe experiments to show electrostatic charging by
friction

- describe experiments to show the force on
a beam of charged particles in a magnetic field

how'd u prepare for thiiis?

I Ctrl+F-ed ''experiments'' in the syllabus. GENIUS ^^

 

[Anonymous321]

Also, do u know when the repulsive forces between two suspended rods (of like charges, offc) would be greatest;

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Physics (5054)/5054_s10_qp_41.pdf

ATP Q4 ^ The marking scheme is, as as usual, vague about the answer. Or maybe I dont gut it :|

 

[FLRNAB]

-describe experiments to show electrostatic charging by
friction

- describe experiments to show the force on
a beam of charged particles in a magnetic field

how'd u prepare for thiiis?

I Ctrl+F-ed ''experiments'' in the syllabus. GENIUS ^^

Do you have a book?

 

[Anonymous321]

Do you have a book?

Offcourse I.... dont : P , but it doesn't mention how we can SET UP the experiment....I mean how are we gonna acquire a beam of charged particles?
I figured out the static electricity wala part myself.

http://maxpapers.com/wp-content/uploads/2012/11/5054_w11_qp_21.pdf

Q7(a) here. If u know the correct answer to this one, you're a genius. share ur genius with me too, then?

PLEASE DO ANSWER! I'm dependent on your help (nobody's answering on forums )

 

[FLRNAB]

Offcourse I.... dont : P , but it doesn't mention how we can SET UP the experiment....I mean how are we gonna acquire a beam of charged particles?
I figured out the static electricity wala part myself.

http://maxpapers.com/wp-content/uploads/2012/11/5054_w11_qp_21.pdf

Q7(a) here. If u know the correct answer to this one, you're a genius. share ur genius with me too, then?

PLEASE DO ANSWER! I'm dependent on your help (nobody's answering on forums )

See the R(L) and R(H).

Charged Particles:
Cathode ray tube?
Thermionic emission?

The experiment is of a current carrying wire in a magnetic field.
See http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/forwir2.html
Dude just watch the khan academy video's mentioned here and you can get a A*.
Magnetism video for this experiment. See 3 to 5

I am sorry. I am quite busy myself. Will try to answer you at night. Just go to some genius person's profile here and post your question then you won't get any drama.

 

[Anonymous321]

Thanks FLRNAB BEST OF LUCK!

 

[hussain777]

The syllabus states
''draw scale diagrams to determine the focal length
of a converging lens needed for particular values of
magnification''

How do we do this!
And please read the question carefully before you answer.

you can get some phusics revision notes HERE

 

[hussain777]

The syllabus states
''draw scale diagrams to determine the focal length
of a converging lens needed for particular values of
magnification''

How do we do this!
And please read the question carefully before you answer.

you can get some phusics revision notes

Mainay kia karna hai ?

kuch nahi

 

[hussain777]

hmmmm yea I get it now : D Did u go into depth with Cameras and Slide Projectors and Photo Enlargers?

u dont have to except a simple camera