Answer:
3.75 × 10⁻⁸ N
Explanation:
Given:
Intensity of the electromagnetic wave, I = 150 W/m²
Sides of the board = 25 cm (= 0.25 m) and 30 cm (= 0.30 m)
therefore,
the area of the rectangular box, A = 0.25 × 0.30 = 0.075 m²
Now,
force exerted on the card by the radiation, F = [tex]\frac{IA}{C}[/tex]
here,
C is the speed of the light = 3 × 10⁸ m/s
on substituting the respective values, we get
F = [tex]\frac{150\times0.075}{3\times10^8}[/tex]
or
F = 3.75 × 10⁻⁸ N
