Physics Paper 5 tips

[scouserlfc]

What to write in time base calculation of a cro!

If u want to calculate time period or frequency of a wave u do this .
First measure out the no. of divisions which are used to accommodate a period. Now from the X gain which is basically a selector type of a knob which can be selected to many values read of the value that is currently selected it shud be in the following units (value) s/divisions so u multiply the divisions u found with this and u have a period. now use 1/T to get f if needed.

 

[scouserlfc]

Hey guys how to keep current constant in a circuit??? any idea?

Use a variable resistor or rheostat and an ammeter connected in series and constantly monitor ammeter reading if it varies adjust rheostat to bring the value back to normal or set level. (so in the diagram draw these two components in the circuit u draw).

 

[Champ101]

Use a variable resistor or rheostat and an ammeter connected in series and constantly monitor ammeter reading if it varies adjust rheostat to bring the value back to normal or set level. (so in the diagram draw these two components in the circuit u draw).

Awesome bro!! thanks a lot!!

 

[scouserlfc]

Guys, can some one explain how a light gate works? Like for example is the right method:
When a rotating object connected by a rod to a pole, and we are measuring the time taken for one complete oscillation. A light gate is used. In order for this to work, the object passes through the light gate once, time t1 is noted. And when it completes one other oscillation time t2 is noted. So the time taken for one oscillation is t2-t1?

I dont know abt light gates its pretty complicated this but i would rather use stop watch and measure out time for 10 oscillations and then average to get time period since u say the object rotates and assuming it has time period which i can measure if i cant measure this time or its too error prone use a video camera to record and then use the playback option and play video frame by frame and use the timer in the video to get the time.

 

[scouserlfc]

Awesome bro!! thanks a lot!!

Welcome

 

[scouserlfc]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s10_qp_51.pdf Q2c

Whats the problem in this bro ??? You need to get gradient after plotting graph are u getting those parallel lines (worst fit and best fit problem ) ???

 

[A star]

I dont know abt light gates its pretty complicated this but i would rather use stop watch and measure out time for 10 oscillations and then average to get time period since u say the object rotates and assuming it has time period which i can measure if i cant measure this time or its too error prone use a video camera to record and then use the playback option and play video frame by frame and use the timer in the video to get the time.

no in some cases light gates are neccesary :/

 

[itallion stallion]

If u want to calculate time period or frequency of a wave u do this .
First measure out the no. of divisions which are used to accommodate a period. Now from the X gain which is basically a selector type of a knob which can be selected to many values read of the value that is currently selected it shud be in the following units (value) s/divisions so u multiply the divisions u found with this and u have a period. now use 1/T to get f if needed.

Thanks alot!
To measure amplitude,i will multiply y gain and no of divisions of the amplitude to form!

 

[A star]

Thanks alot!
To measure amplitude,i will multiply y gain and no of divisions of the amplitude to form!

yes and always mention that long info he wote or calibrate y gain and the time base circuit and use f=1/T to find the frequency :3

 

[A star]

Whats the problem in this bro ??? You need to get gradient after plotting graph are u getting those parallel lines (worst fit and best fit problem ) ???

i mean how to find out the uncertainity of Xc pls explain :3

 

[itallion stallion]

yes and always mention that long info he wote or calibrate y gain and the time base circuit and use f=1/T to find the frequency :3

Ahan thanks!

 

[Dukeofwin]

http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_w13_qp_52.pdf

Question 1 says to draw a diagram for the experiment we have to design and marking scheme says the same diagram is to be drawn with few additions.
So we actually copy the diagram given and add a few details right?

 

[itallion stallion]

What to write for the use of hall probe for measuring magnetic field!

 

[A star]

Whats the problem in this bro ??? You need to get gradient after plotting graph are u getting those parallel lines (worst fit and best fit problem ) ???

pls do i have been stuck for actually 2 hours

 

[scouserlfc]

Thanks alot!
To measure amplitude,i will multiply y gain and no of divisions of the amplitude to form!

Yes sir

 

[scouserlfc]

pls do i have been stuck for actually 2 hours

Check the ms part c where they tell u if plotted properly the line should pass through the following points use that to get a fair idea to plot the line because its too difficult to draw that on computer.

 

[scouserlfc]

i mean how to find out the uncertainity of Xc pls explain :3

wait !

 

[A star]

Check the ms part c where they tell u if plotted properly the line should pass through the following points use that to get a fair idea to plot the line because its too difficult to draw that on computer.

no yar i mean can you find out the uncertainity for the value of Xc????

 

[A star]

wait !

p.s u r the first liverpool fan i find good XD ( dont mind)

 

[Dukeofwin]

no yar i mean can you find out the uncertainity for the value of Xc????

wait !

Same here I'm stuck on that too. (PS I'm a kopite too )