AP EAMCET · PHYSICS · Electromagnetic Waves
Suppose that the electric field of an electromagnetic wave in vacuum is \(\mathbf{E}=\left(3.1 \mathrm{NC}^{-1}\right) \cos \left[1.8 \mathrm{rad} . \mathrm{m}^{-1}\right)\) \(\left.y+\left(5.4 \times 10^6 \mathrm{rad} \mathrm{s}^{-1}\right) t\right] \hat{\mathbf{i}}\). What is the wavelength \(\lambda\) ?
- A \(3.49 \mathrm{~m}\)
- B \(3.50 \mathrm{~m}\)
- C \(3.40 \mathrm{~m}\)
- D \(3.45 \mathrm{~m}\)
Answer & Solution
Correct Answer
(A) \(3.49 \mathrm{~m}\)
Step-by-step Solution
Detailed explanation
Given that, equation of electric field of an electromagnetic wave in vacuum, \(\mathbf{E}=\left(3.1 \mathrm{NC}^{-1}\right)\) \(\cos \left[\left(1.8 \mathrm{rad} \mathrm{m}{ }^{-1}\right) y+\left(5.4 \times 10^6 \mathrm{rad} \mathrm{s}^{-1}\right) t\right] \hat{\mathbf{i}}\) We…
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