AP EAMCET · PHYSICS · Electromagnetic Waves
In a plane electromagnetic wave, the maximum value of the electric field component is \(4.4 \mathrm{Vm}^{-1}\). The intensity of the wave is nearly
- A \(22.4 \mathrm{~mW} \mathrm{~m}^{-2}\)
- B \(25.7 \mathrm{~mW} \mathrm{~m}^{-2}\)
- C \(65.5 \mathrm{~mW} \mathrm{~m}^{-2}\)
- D \(45.6 \mathrm{~mW} \mathrm{~m}^{-2}\)
Answer & Solution
Correct Answer
(B) \(25.7 \mathrm{~mW} \mathrm{~m}^{-2}\)
Step-by-step Solution
Detailed explanation
We know that \(\mathrm{I}=\frac{1}{2} \varepsilon_0 \mathrm{E}_0^2 \mathrm{C}\) \(\begin{aligned} & =\frac{1}{2} \times 8.85 \times 10^{-12} \times 4.4^2 \times 3 \times 10^8 \\ & =25.7 \mathrm{~mW} / \mathrm{m}^2\end{aligned}\)
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