When we talk about the frequency of an EM wave, what are we really talking about

Question

When we talk about the frequency of an EM wave, what are we really talking about? Select all the correct options The time it takes the B-field in the wave to go from zero, reverse direction, then go back to zero. The number of times each second the B-field in the wave increases from zero and goes back to zero. The time it takes the E-field in the wave to go from zero, reverse direction, then go back to zero. The number of times each second the E-field in the wave increases from zero and goes back to zero. The number of times each second the E-field in the wave increases from zero, goes back to zero, increases in the reverse direction, and goes back to zero again. The number of times each second the B-field in the wave increases from zero, goes back to zero, increases in the reverse direction, and goes back to zero again.

Explanation / Answer

Frequency is number of oscillations made by the wave in one second.One oscillation means the particles of the medium from equilibrium position(zero) to vibrate maximum amplitude and reaches to (zero) and vibrate minimum amplitude(reverse) and reaches again to zero.

In electro magnetic waves, electric field vectors and magnetic field vectors are simultaneously oscillates normal to each other and normal to the direction of wave propagation.

From the above points, the following statements (last two options )are true.

The number of time in each second the E-field in the wave increases from zero,goes back to zero, increases in the reverse direction, and goes back to zero again.

The number of time in each second the B-field in the wave increases from zero,goes back to zero, increases in the reverse direction, and goes back to zero again.

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