Answer:
Intensity, [tex]I=1.101\ W/m^2[/tex]
Explanation:
Power of the light bulb, P = 40 W
Distance from screen, r = 1.7 m
Let I is the intensity of light incident on the screen. The power acting per unit area is called the intensity of the light. Its formula is given by :
[tex]I=\dfrac{P}{A}[/tex]
[tex]I=\dfrac{P}{4\pi r^2}[/tex]
[tex]I=\dfrac{40\ W}{4\pi (1.7\ m)^2}[/tex]
[tex]I=1.101\ W/m^2[/tex]
So, the intensity of light is [tex]1.101\ W/m^2[/tex].
