Physics

Given $$P = 0.0030 \,m, Q = 2.40 \,m$$ and $$R = 3000 m$$, then number of significant figure in $$P, Q, R$$ are respectively:


ANSWER

$$2, 3, 4$$


SOLUTION
$$P = 0.00 \,\underset{1}{\underset{\uparrow}{3}}\underset{2}{\underset{\uparrow}{0}} m$$

No. of digits (significant) $$= 2$$
$$Q = \underset{1}{\underset{\uparrow}{2}}.\underset{2}{\underset{\uparrow}{4}}\underset{3}{\underset{\uparrow}{0}} \,m$$
Digit $$= 3$$

$$R = \underset{1}{\underset{\uparrow}{3}}\underset{2}{\underset{\uparrow}{0}}\underset{3}{\underset{\uparrow}{0}}\underset{4}{\underset{\uparrow}{0}} \,m$$
Digit $$= 4$$
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