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The electric field associated with an e.m. wave in vacuum is given by E→̂40 cos (kz -6 × 108t), where E, z and t are in volt/m, meter and seconds respectively. The value of wave vector k is :
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- 2 m-1
- 0.5 m-1
- 6 m-1
- 3 m-1
Correct Option: A
On comparing the given equation to
⇒E = a0 îcos(ωt - kz)
ω = 6 × 108
| k = | = | |||
| r | c |
| k = | = | = 2m-1 | ||
| c | 3 × 108 |
