Physics

Problem

Evaluate

\dfrac{6.626 \times 10^{-34}\,\text{J\;s} \times 3.0 \times 10^{8}\,\text{m\;s}^{-1}}{1.60 \times 10^{-19}\,\text{C} \times 2.5}

and express the result with the correct number of significant figures. a)

4.97 \times 10^{-7}

5.0 \times 10^{-8}

5.0 \times 10^{-7}

1.2 \times 10^{-6}