Physics · 2018
JEE Main · 15 April 2018, Shift 2 · Q21
A plane polarized monochromatic EM wave is traveling in vacuum along z direction such that at t=t_1 it is found that the electric field is zero at a…
A plane polarized monochromatic EM wave is traveling in vacuum along $\displaystyle z$ direction such that at $\displaystyle t=t_1$ it is found that the electric field is zero at a spatial point $\displaystyle z_1$. The next zero that occurs in its neighbourhood is at $\displaystyle z_2$. The frequency of the electromagnetic wave is :
Official answer
(2)
$\displaystyle \frac{1.5 \times 10^8}{\left|z_2-z_1\right|}$
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JEE Main 2018 Physics question, with the answer from NTA’s final answer key. Where our answers come from.