Electromagnetic Wave II

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A plane monochromatic electromagnetic wave with wavelength $=5\mathrm{.}6$ cm$,$ propagates through a vacuum. Its magnetic field is described by

B$=($Bxi$^+$Byj$^)$cos$($kz$+$t$)$

where Bx $=1\mathrm{.}3$ X $10-6$ T$,$ By $=3\mathrm{.}8$ X $10-6$ T$,$ and i$-$hat and j$-$hat are the unit vectors in the $+$x and $+$y directions, respectively.

$1)$

What is f$,$ the frequency of this wave?

GHz

Submit

Your submissions:

$5\mathrm{.}36$

Computed value:

$5\mathrm{.}36$

Submitted:

Wednesday, November $20$ at $11$:$37$ PM

Feedback:

Your answer has been judged correct; the exact answer is: $5\mathrm{.}35714285714286.$

$2)$

What is I, the intensity of this wave?

W$/$m$2$

Submit

Your submissions:

$1927\mathrm{.}13$

Computed value:

$1927\mathrm{.}13$

Submitted:

Wednesday, November $20$ at $11$:$38$ PM

Feedback:

Your answer has been judged correct; the exact answer is: $1928\mathrm{.}046321.$

$3)$

What is Sz$,$ the z$-$component of the Poynting vector at $($x $=0,$ y $=0,$ z $=0)$ at t $=0?$