A sphere of radius 1.00 cm is placed in the path of a parallel beam of light of large aperture. The intensity of the light is 0.50 W cm –2 . If the sphere completely absorbs the radiation falling on it, find the force exerted by the light beam on the sphere.

Question

Philoid · Accepted Answer

If the is fully absorbing then force exerted is

=

Then

Where I= intensity.

A=area

In this area, is the perpendicular area in which it falls.

∴

Hence, force is

=.

=

A sphere of radius 1.00 cm is placed in the path of a parallel beam of light of large aperture. The intensity of the light is 0.50 W cm–2. If the sphere completely absorbs the radiation falling on it, find the force exerted by the light beam on the sphere.

A sphere of radius 1.00 cm is placed in the path of a parallel beam of light of large aperture. The intensity of the light is 0.50 W cm^–2. If the sphere completely absorbs the radiation falling on it, find the force exerted by the light beam on the sphere.