Radiation pressure on an object absorbing all the light:

$\overline{){{\mathbf{P}}}_{\mathbf{r}\mathbf{a}\mathbf{d}}{\mathbf{=}}\frac{\mathbf{I}}{\mathbf{c}}}$, where I is the intensity of lightwave and c is the speed of light.

**A)**

From the boxed equation:

${\mathit{P}}_{\mathbf{r}\mathbf{a}\mathbf{d}}\mathbf{=}\frac{\mathbf{2500}}{\mathbf{3}\mathbf{.}\mathbf{0}\mathbf{\times}{\mathbf{10}}^{\mathbf{8}}}$

In the 25-ft Space Simulator facility at NASA's Jet Propulsion Laboratory, a bank of overhead arc lamps can produce light of intensity 2500W/m2 at the floor of the facility. (This simulates the intensity of sunlight near the planet Venus.)

A) Find the average radiation pressure (in pascals) on a totally absorbing section of the floor.

B) Find the average radiation pressure (in atmospheres) on a totally absorbing section of the floor.

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