Paper 3 Defintions

Question 1

Accuracy

Answer 1

Quality denoting closeness of the measured value to true value

Question 2

Precision

Answer 2

Quality denoting the closeness of agreement between measured values (by repeated measurements)

Remember protractor is less effeicnt

Question 3

DOPPLER EFFECT

Answer 3

The apparent shift in OBEERVED FREWUENCY a due to the relative motion between observer and source

Question 4

How to do explain why bigger

Answer 4

Always write down the expressions, blud pay attention to scenario at hand, which is uothrust involved, so include this

CALCUALTE them if you really want but expression is fine!

Need more than sumo,e words

Question 5

Remember calculating weight on new planet!

Answer 5

Use g = 9.81!

Question 6

What makes accuracy of experiment calculation , in terms of absolute uncertiwnties, difference etc

Answer 6

If the value accrual the falls in the absolute range accuratr

If thr percentage uncertainty falls greater than percentage difference thid tells you it !

Question 7

What should you use to differntiate gamma and beta

Answer 7

Aluminium sheet which is few mmm, will be completely abdribed by beta !

( not lead AS GAMMA MIGHT BE ABSORBED, HENCE ,UST BE ALLUMNKUM!)

Question 8

How to do radiation pag

Answer 8

Clamp source fixed

And to keep safe LIMIT THE TIME EMITTED!

Question 9

REMEMBER HOW TO FIND DISTANCES BETWEEN MAXIMUM IN DOUBLE SLIT

Answer 9

NEVER LACK ! ITS NOT LAMBDA /2, ALWAYS AND ONLY USE LAMBDA = AX D

• try to explain this in temrs of PLD

Question 10

How to measure thr stuff double slit

Answer 10

Yeah 10x, /10, social old standard

Question 11

Huge important

Rotating waves, what happens to intrnsities and interference pattern 0 to 180?

Answer 11

At 90, there is NO INTERFERENCE PATTERN
- this bevaude waves with polarisation perpendicualr to each other do. It interfere, must have a component. In the plane
- so what happens? : the interference pattern dissepars, but this means CONSTSNT INTENSITY, not 0 intensity along PQ!

At 180, intensities are same but POSITION OF MAXIMA AND MINIMA ARE SWITCHED!

• from 0 to 90, the maxima decreases intensity and minima increases

From 90 to 180, the minima increase maxima decrease !

Question 12

No matter what , what is time CONSTSNT defintion

Answer 12

Time taken to fall to 37% of Orginal v , q , I, or charge to 63% of q, v depending on the system, of ORIGNAL VALUE

must say origanl!

Question 13

Man you’re finished, how to use equation to find time constant

Answer 13

Don’t lack, must do time from decay, not time at decay?
Stupid ugly

Test out using another to double check

Question 14

Drawing graph of current charge discharge based on charge

Answer 14

We know current is protionsl to charge, so based on the charge, there will be exponential increase decrease

Now when charge in capacitor is max , charge in resistor is min, hence current in resort is min

Then it charges and de charged accordingly, osciallte for betwene min and max?..

Don’t lack!

Remember sum of pd must be emf by 2nd law too

Question 15

What is a hall probe

Answer 15

Device used to measure flux density directly
Essentially semi conductor , current runs down , with magentic field applied
- this deflects electrons, causing one side of plate to accumulate negative charge, other positive by induction ( repels electrons, number repealed are number added, hence charge oppsite )

-this creates a pot de tail difference, hall voltage, which can relate to the magnetic field