Which practical do you expect for Physics Unit 3 May 2017?

OP

Original post by rayyanbkc

Apparatus : Voltmetre , ammeter , variable resistor , battery

set up the circuit using the apparatus above and take about 6 readings for current and terminal PD by increasing the variable resistor in regular intervals .

plot a graph of terminal PD (v) against current ( I) .

the gradient will give the eternal resistance and the y intercept is the emf .

Dont u thing something will come from waves or polarisation??

Reply 5

Original post by THE OBSERVER123

Dont u thing something will come from waves or polarisation??

High chance as well .

Important topics like polarisation stress concentration and melde's experiment .

Reply 6

OP

Original post by rayyanbkc

High chance as well .

Important topics like polarisation stress concentration and melde's experiment .

WhT do u mean by stress concentration

Reply 7

Original post by THE OBSERVER123

WhT do u mean by stress concentration

The experiment used to measure the concentration of an unknown solution I can explain if you want .

Reply 8

OP

Original post by rayyanbkc

The experiment used to measure the concentration of an unknown solution I can explain if you want .

Yes sure.

Reply 9

Original post by THE OBSERVER123

Yes sure.

Apparatus : 2 polarising filters , a glass tube , a 360 degree protractor . Light source

take your first filter and put it in front of the glass tube and your second one behind the glass tube .Make sure they are aligned perpendicular to each other . (check by shining a source of light and see if it becomes fully polarised )

Fill the tube with a fixed concentration of sugar solutions (20-100g) and shine light through the tube . You will find that some light will pass through the end of the tube as the concentration changed the direction of the light .
Keep rotating the second filter until all the light is polarised again and nothing passes through . Use the protractor to measure the angle that you rotated your filter and finally plot a graph of angle of rotation against concentration .

Repeat for different sugar concentrations .

Reply 10

OP

Original post by THE OBSERVER123

WhT do u mean by stress concentration

and plz this melde's experiment

Reply 11

Original post by THE OBSERVER123

and plz this melde's experiment

Apparatus : String , metre stick , loads , balance

Take a long string of about 0.5 m and fix it firmly in both ends using a bench .

Connect one side of the string to a vibration generation and the other with a hook containing loads of about 10N each .
Connect a signal generator to the vibration generator and vary it to produce nodes and anti-nodes in the spring .

measure tension which is mg and the mass per unit length of the string by diving the mass of the string by it's length .

Finally square root tension/mass per unit length to get the value of wave speed .
Soz for late reply

Reply 12

OP