Light intensity on a wall, Physics

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Light intensity on a wall

A 100 W lightbulb produces 4.0 W of visible light.

(a) What is the light intensity on a wall 3.0 m away from the lightbulb?

(b) Where did the 96 W go?

(c) A krypton laser produces a cylindrical red laser beam 3.0 mm in diameter with 4.0 W of power.

What is the light intensity on a wall 5.0 m away from the laser?

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