# Physics Practicals (Justification)

#### Wolfgangs

Hello everyone,

I'm a new student for As level and I'm currently 3 subjects only (Biology, Physics and Mathematics). I noticed that in paper 3 physics there is usually a question repeated in almost all of the practical papers.
"Justify the number of signiﬁcant ﬁgures that you have given for your values of k." Well, does it actually mean? Please give me some of your knowledge and tips about that question.

Thank you

• ruby_fern and FLRNAB

#### 98degrees

If your raw data is to 3 s.f., then your calculated value can be to either 3 or 4 s.f.

• MarcoReus

#### kitkat <3 :P

If your raw data is to 3 s.f., then your calculated value can be to either 3 or 4 s.f.

its better that all the readings should be in the same number of significant figures

• MarcoReus

#### AnujaK

• MarcoReus and areebaization

#### Wolfgangs

If your raw data is to 3 s.f., then your calculated value can be to either 3 or 4 s.f.
So that is the answer that I should mention in that question?

• MarcoReus

#### Wolfgangs

What should I exactly write in the justification of significant figure? Like, how should I write my answer?

#### princessnoor

What should I exactly write in the justification of significant figure? Like, how should I write my answer?
if e.g formula is k=v/I( k is a constant ) and v value is to 2 sig.fig nd of I is to 3 sig.fig so k should hve 2 sig fig cuz thy r least (from 2 and 3)
u get it?

#### Garvita

Hey
What ca we write in justification
Like only the weight of the object is given and asked is this value correct
So,what do I write there