Question

A black, totally absorbing piece of cardboard of area A = 1.7 cm2 intercepts light with an intensity of 8.1 W/m2 from a camera strobe light. What radiation pressure is produced on the cardboard by the light?

Answer 1

The answer is 2.7x10⁻⁸ Pa

Step-by-step explanation:

The expression for total absorption is:

Pr = I/c

Where I = intensity of light

c = velocity of light

Replacing:

Pr = 8.1/3x10⁸ = 2.7x10⁻⁸ Pa

Answer 2

2.7x10⁻⁸ N/m²

Step-by-step explanation:

Since the piece of cardboard absorbs totally the light, the radiation pressure can be found using the following equation:

`p_(rad) = (I)/(c)`

Where:

`p_(rad)`: is the radiation pressure

I: is the intensity of the light = 8.1 W/m²

c: is the speed of light = 3.00x10⁸ m/s

Hence, the radiation pressure is:

`p_(rad) = (I)/(c) = (8.1 W/m^(2))/(3.00 \cdot 10^(8) m/s) = 2.7 \cdot 10^(-8) N/m^(2)`

Therefore, the radiation pressure that is produced on the cardboard by the light is 2.7x10⁻⁸ N/m².

I hope it helps you!