Physics Paper 51 Guess

[solidboy123]

Any guesses???

 

[hassam]

radioactivity

 

[solidboy123]

radioactivity

Like can u tell me plzz that what will we have to measure and all, it would be really helpful

 

[hassam]

weellll m just amking a wild guess........safet precaution use source handling tool...........store source in lead box wen not in use.........additional detail subtract background count from count rate measured...........background cont measured without the s9ource....GM connected to scalar.....well repeat count rate de to randomness of activitry

 

[earthling]

weellll m just amking a wild guess........safet precaution use source handling tool...........store source in lead box wen not in use.........additional detail subtract background count from count rate measured...........background cont measured without the s9ource....GM connected to scalar.....well repeat count rate de to randomness of activitry

What's scalar??

 

[hassam]

ratemeter

 

[earthling]

Must the worst acceptable line from Q2 be dotted?? And how to make it pass through all error bars?

 

[thunderingthunder]

Must the worst acceptable line from Q2 be dotted?? And how to make it pass through all error bars?

I think it is not compulsory that the worst acceptable line passes through all the error bars!And yes the line must be dotted..

 

[earthling]

I think it is not compulsory that the worst acceptable line passes through all the error bars!And yes the line must be dotted..

Okay , thanks!

 

[thunderingthunder]

Okay , thanks!

np

 

[larina]

I think it is not compulsory that the worst acceptable line passes through all the error bars!And yes the line must be dotted..

its not compulsory for the line to be dotted, u can make a staright line and label it
and it is compulsory that worst acceptable line passes through ALL the error bars!!!

 

[ousamah112]

I think it is not compulsory that the worst acceptable line passes through all the error bars!And yes the line must be dotted..

it should pas thru all error bars... and it does passes no matter what..

 

[thunderingthunder]

it should pas thru all error bars... and it does passes no matter what..

its not compulsory for the line to be dotted, u can make a staright line and label it
and it is compulsory that worst acceptable line passes through ALL the error bars!!!

Thank you for correcting me
All the best for your exams

 

[larina]

Thank you for correcting me
All the best for your exams

u said the opposite
best of luck to u too!

 

[ousamah112]

Thank you for correcting me
All the best for your exams

can you help me with hall probe??? i cant figure out how do we make a circuit with hall probe like in m/j 1o 52 http://www.xtremepapers.com/papers/...nd AS Level/Physics (9702)/9702_s10_qp_52.pdf

 

[larina]

can you help me with hall probe??? i cant figure out how do we make a circuit with hall probe like in m/j 1o 52 http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s10_qp_52.pdf

just make a hall probe which is normall to the dorectiom of magnetic feild..
and it must be connected to a voltmeter
the voltage of hall probe is directly proportional to the magnetic feild strength

 

[ousamah112]

just make a hall probe which is normall to the dorectiom of magnetic feild..
and it must be connected to a voltmeter
the voltage of hall probe is directly proportional to the magnetic feild strength

can you post some rough sketch ??

 

[larina]

can you post some rough sketch ??

 

[larina]

can you post some rough sketch ??

sorry i cant upload the file :s

 

[aaditya menon]

Btw, for the rough check the .pdf file teaching A2 practical skills. It's there around pg 66, im not sure, perfect diagram.

Safety

Wear goggles
Water bath cold get hot, spillage
Equipments can be knocked over
Sand box to protect tiles from cracking
USe of tongs to put junction of thermocouple into water bath
If experiment involves sound, use ear defenders.
Light sources could get hot, use gloves
Coil could get hot, use coils, switch off current when not in use
Don't look directly onto light source, use goggles.

Additional details for 4 marks.
Stir water bath to reach uniform temperature
Check for zero error before taking any reading
Use digital voltmeter for accuracy
Switch off current to keep deflection safe/within limits
TO measure depths/lengths in 3-D, use set squares with rule
Use rheostat for constant current
use potential divider for constant voltage.
Repear measurements of lengths/diameter/radius/
thickness at different points and take average
TO measure pressure : Use Manometer/Pressure gauge
To vary pressure : Use pump
Always explain a little theory for extra marks
Explain about calculations using graphs and gradients to earn extra marks
Use vernier calliper, micrometer
Reduce frictional forces using lubricants etc. for mechanical experiments (pulley/inclined planes etc.)
Use spirit level

With hall probe/Magnetism

Hall probe should be perpendicular to magnetic field
Voltmeter across hall probe and dc supply for hall probe (Explain theory about electrons deflection due to magnetic field)
Keep number of turns constant and current constant in coil
Fix hall probe for uniform orientation
Avoid external magnetic fields
Use cross rulers to find the center of the coil
use large current for large magnetic field
repeat experiment with hall probe reversed.