A plane electromagnetic wave in free space is specified by the electri

1.	A plane electromagnetic wave in free space is specified by the electric field
A.	<table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>a<sub>y</sub> </center></td><td rowspan="2">[20 cos ( t + z) + 5 cos ( t + z)] A/m <br></td></tr><tr><td style="text-align: center;"> </td></tr></table>
B.	<table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>a<sub>y</sub> </center></td><td rowspan="2">[20 cos ( t + z) 5 cos ( t + z)] A/m <br></td></tr><tr><td style="text-align: center;"> </td></tr></table>
C.	<table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>a<sub>y</sub> </center></td><td rowspan="2">[20 cos ( t z) + 5 cos ( t + z)] A/m <br></td></tr><tr><td style="text-align: center;">120 </td></tr></table>
D.	<table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>a<sub>y</sub> </center></td><td rowspan="2">[20 cos ( t z) 5 cos ( t + z)] A/m <br></td></tr><tr><td style="text-align: center;">120 </td></tr></table>
Answer» D. <table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>a<sub>y</sub> </center></td><td rowspan="2">[20 cos ( t z) 5 cos ( t + z)] A/m <br></td></tr><tr><td style="text-align: center;">120 </td></tr></table>

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A plane electromagnetic wave in free space is specified by the electric field

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