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Physics-Maxwell's Equations

NEET Physics Maxwell's Equations MCQ Question

Type: MCQ-numerical-Easy-Class 12

If the angular frequency ω\omega of an electromagnetic wave is 6×1015 rad/s6 \times 10^{15} \text{ rad/s}, what is the magnitude of the wave vector kk? Assume the speed of light c=3×108 m/sc = 3 \times 10^8 \text{ m/s}.

A

2×107 rad/m2 \times 10^7 \text{ rad/m}

B

5×107 rad/m5 \times 10^7 \text{ rad/m}

C

2×106 rad/m2 \times 10^6 \text{ rad/m}

D

5×106 rad/m5 \times 10^6 \text{ rad/m}

Correct Answer

Option A

Detailed Explanation

Using the relation ω=ck\omega = ck from Maxwell's equations and given c=3×108 m/sc = 3 \times 10^8 \text{ m/s}, kk can be calculated as k=ω/c=6×1015/3×108=2×107 rad/mk = \omega/c = 6 \times 10^{15} / 3 \times 10^8 = 2 \times 10^7 \text{ rad/m}.

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