A 60-W Light Bulb Emits Spherical Electromagnetic Waves Uniformly in All

question 9

Multiple Choice

A 60-W light bulb emits spherical electromagnetic waves uniformly in all directions.If 50% of the power input to such a light bulb is emitted as electromagnetic radiation,what is the radiation intensity at a distance of 2.00 m from the light bulb?

• A)15 W/m²
• B)4.8 W/m²
• C)2.4 W/m²
• D)0.60 W/m²
• E)1.2 W/m²

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