(1) The wavelength \[\lambda \]is 188.4 m. |
(2) The wave number k is 0.33 rad/m. |
(3) The wave amplitude is 10 V/m. |
(4) The wave is propagating along. + x direction |
A) (3) and (4)
B) (1) and (2)
C) (2) and (3)
D) (1) and (3)
Correct Answer: D
Solution :
The electric field of electromagnetic wave \[\overset{\to }{\mathop{\mathbf{E}}}\,=10\cos ({{10}^{7}}t\pm kx)\,\mathbf{j}\] Amplitude =10 V/m \[\because \] \[c=\frac{\omega }{k}\] \[\therefore \] \[3\times {{10}^{8}}=\frac{{{10}^{7}}}{k}\] or\[k=\frac{1}{30}\] or\[\frac{2\pi }{\lambda }=\frac{1}{30}\]or\[\lambda =188.4\,\text{m}\] So, (1) and (3) option are correct.You need to login to perform this action.
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