QUESTIONS $2931$: A $60$ W light bulb emits light uniformly in all directions. Assume that only

$50\%$ of the power input to such a light bulb is emitted as electromagnetic radiation. At a point $2\mathrm{.}0$

m from the bulb, determine the...

$29....$ radiation intensity.

$($a$)15$ W$/$m$2$

$($b$)4\mathrm{.}8$ W$/$m$2$

$($c$)2\mathrm{.}4$ W$/$m$2$

$($d$)0\mathrm{.}60$ W$/$m$2$

$($e$)1\mathrm{.}2$ W$/$m$2$

$30....$ radiation pressure exerted on a totally absorbing surface.

$($a$)50$ nPa

$($b$)1\mathrm{.}9$ nPa

$($c$)8\mathrm{.}0$ nPa

$($d$)16$ nPa

$($e$)4\mathrm{.}0$ nPa

$31....$ the amplitude of the electric field.

$($a$)43$ V$/$m

$($b$)1\mathrm{.}2$ mV$/$m

$($c$)21$ V$/$m

$($d$)60$ V$/$m

$($e$)30$ V$/$m