Speed of electromagnetic waves is the same:

for all wavelengths

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in all media

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for all intensities

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for all frequencies

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Solution

The correct option is C for all intensities
Speed of electromagnetic waves is dependent upon medium as,
$v = \frac{c}{n}$
where $c$ is the speed of light in vacuum, $n$ is the refractive index in the medium.
Speed is dependent on wavelength and frequency as
$v = λ ν$
It is independent of intensity.

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