STANDARDPhysics-Electromagnetic Waves
STANDARD Physics Wave Properties MCQ Question
Type: MCQ-numerical-Medium-Class 12
The electric field part of an electromagnetic wave in vacuum is E = 3.1 N C⁻¹ × cos [(1.8 rad m⁻¹) y + (5.4 × 10⁸ rad s⁻¹) t]. The wavelength of this part of electromagnetic wave is
A
1.5 m
B
2 m
C
2.5 m
D
3.5 m
Correct Answer
Option D
Detailed Explanation
The wave number k = 1.8 rad m⁻¹. The wavelength λ is given by λ = 2π/k. Substituting the value of k, we get λ = 2π/1.8 = 3.5 m.
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