Physics · 2009
NEET 2009 · Prelims · Code A · Q22
The electric field part of an electromagnetic wave in a medium is represented by E_x=0; E_y=2.5 N/C Cos [(2 π × 10^6 rad/m) t-(π × 10^-2 rad/s) x];…
The electric field part of an electromagnetic wave in a medium is represented by $\displaystyle E_x=0$ ;
$$E_y=2.5 \frac{\mathrm{~N}}{\mathrm{C}} \operatorname{Cos}\left[\left(2 \pi \times 10^6 \frac{\mathrm{rad}}{\mathrm{~m}}\right) t-\left(\pi \times 10^{-2} \frac{\mathrm{rad}}{\mathrm{~s}}\right) x\right] ;
$$
$\displaystyle E_z=0$. The wave is :
Official answer
(4)
moving along $\displaystyle x$ direction with frequency $\displaystyle 10^6 \mathrm{~Hz}$ and wave length $\displaystyle 200 m$.
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NEET (UG) 2009 Physics question, with the answer from NTA’s final answer key. Where our answers come from.