Physics

Subtract $$2.5 \times {10}^{4}$$ from $$3.9 \times {10}^{5}$$ and give the answer to correct number of significant figures.


ANSWER

 $$ 3.6\times 10^5$$


SOLUTION
We have $$ 3.9 \times 10^5- 2.5 \times 10^4$$
 $$ = 3.9 \times 10^5- 0.25 \times 10^5$$
$$ =3.65 \times 10^5$$
But our answer should be rounded off upto two significant digits.
So the ans is $$ 3.6\times 10^5$$
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