Ablack, absorbing piece of card board of area a = 2.0 cm2 absorbs light with intensity 18 w/m2. what is the force exerted on the cardboard by the light? b) 9.33x10-12 n e) 1.67x10-11 n a) 6.67x10-12 n d) 1.20x10-11 n c) 1.15x10-12 n

The force exerted on the cardboard by the light is

Explanation:

It is given that,

Area of the cardboard,

Intensity of absorbance,

Radiation pressure in case of absorption is given by :

...........(1)

c is the speed of light

The relation between force and pressure is given by :

.......(2)

From equation (1) and (2):

So, the force exerted on the cardboard by the light is . Hence, this is the required solution.

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