AIPMT PRELIMS2012Physics-Electromagnetic Waves
AIPMT PRELIMS 2012 Physics Wave Equation MCQ Question
Type: MCQ-numerical-Medium-Class 12
The electric field associated with an e.m. wave in vacuum is given by E̅ = î40cos(kz − 6 × 10⁸t), where E, z and t are in volt/m, meter and seconds respectively. The value of wave vector k is
A
3 m⁻¹
B
2 m⁻¹
C
0.5 m⁻¹
D
6 m⁻¹
Correct Answer
Option B
Detailed Explanation
The wave vector k is related to the angular frequency ω and speed of light c by k = ω/c. Substituting the given values, k = 2 m⁻¹.
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