Nearly 10 % of the power of a 110 W light bulb is converted to visible radiation. The change in average intensities of visible radiation, at a…

Nearly $\displaystyle 10 \%$ of the power of a $\displaystyle 110$ W light bulb is converted to visible radiation. The change in average intensities of visible radiation, at a distance of $\displaystyle 1$ m from the bulb to a distance of $\displaystyle 5$ m is $\displaystyle a \times 10^{-2} \mathrm{~W} / \mathrm{m}^2$. The value of ' $\displaystyle a$ ' will be \_\_\_\_.