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The amplitude of electromagnetic wave in vacuum is doubled with no other changes made to the wave. As a result of this doubling of the amplitude, which of the following statement is correct?

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The speed of wave propagation changes only

The frequency of the wave changes only

The wavelength of the wave changes only

None of the above is true

answer is D.

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Detailed Solution

Velocity of electromagnetic wave $c = \frac{1}{\sqrt{μ_{0} \in_{0}}} = 3 \times 10^{8} m / s$ is independent of amplitude of e.m. wave, frequency and wavelength of e.m. wave.

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