Question
Energy from the Sun arrives at the top of the Earth’s atmosphere with an intensity of $1.30 \textrm{ kW/m}^2$ How long does it take for $1.8 \times 109 \textrm{ J}$ to arrive on an area of $1.00 \textrm{ m}^2$?

$16 \textrm{ days}$

Note: this answer should have two significant figures on account of the 2 sig. figs. in the energy given in the question ($1.8 \times 10^9 \textrm{ J}$. The video mistakenly shows three significant figures in the final answer.

Solution Video