The Rate of Energy Flow Per Unit Area of an Electromagnetic

question 11

Multiple Choice

The rate of energy flow per unit area of an electromagnetic wave has an average value of $0.695$ $\mathrm { W } / \mathrm { m } ^ { 2 }$ . The wave is incident at right angles upon a rectangular area measuring $1.5 \mathrm {~m}$ by $2.0 \mathrm {~m}$ .
How much total energy falls upon this rectangle each minute? $\left( \varepsilon _ { 0 } = 8.85 \times 10 ^ { - 12 } \mathrm { C } 2 / \mathrm { N } \cdot \mathrm { m } ^ { 2 } , \mu _ { 0 } = 4 \right.$ $\pi \times 10 ^ { - 7 } \mathrm {~T} \cdot \mathrm { m } / \mathrm { A } , c = 3.0 \times 10 ^ { 8 } \mathrm {~m} / \mathrm { s }$ )

• A) \(250 \mathrm {~J}\)
• B) \(160 \mathrm {~J}\)
• C) \(130 \mathrm {~J}\)
• D) \(220 \mathrm {~J}\)
• E) \(190 \mathrm {~J}\)

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