How many significant figures are there in the following number ?
$$8000$$
$$\textbf {Four}$$.
However, if expressed in scientific notation as $$8 \times 10^3,$$ it will have only one significant figure, as $$8.0 \times 10^3, 8.00 \times 10^3$$ or $$8.000 \times 10^3,$$ it will have 2, 3 or 4 significant figures.