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Significant figures

Does anyone know to what significant figures physics questions (A-level) want the answers to be given to? I think I heard somewhere that its to the lowest significant figure of the answer? If it is then what if they gave the following:
r=0.50m
mass=0.5kg
Find the density of the sphere.
Answer: 0.9549...
What would be the appropriate one?

(edited 3 years ago)

Reply 1

234UncleBob

Original post by Smokestar

Usually if your unsure give your answer to 2/3 sig fig, especially if you see that they've gave a value to that amount of sig fig in the question.

In this I would use 2 sig fig, 0.95 kg/m3

Like, if this helps! :smile:

Reply 2

Smokestar

Thank you. Ive been doing past papers and sometimes my answer is off because of the way they round it and ive been marking myself down which has really been upsetting me.

Reply 3

234UncleBob

Original post by Smokestar

Thank you. Ive been doing past papers and sometimes my answer is off because of the way they round it and ive been marking myself down which has really been upsetting me.