NEET-XII-Physics
40: Electromagnetic Waves
- #3Speed of electromagnetic waves is the same
(a) for all wavelengths
(b) in all media
(c) for all intensities
(d) for all frequenciesdigAnsr: cAns : (c) for all intensities
For any given medium, the speed (c) of an electromagnetic wave is given by
c = νλ,
where
ν = ​frequency of the electromagnetic wave
λ = ​wavelength of the electromagnetic wave
As the frequency and wavelength are changed, the speed of the electromagnetic wave changes. So, the speed of an electromagnetic wave is not same for ​all wavelengths and​ all frequencies in any medium. The velocity of an electromagnetic wave changes with change in medium. Also, the speed of an electromagnetic wave is same for all the intensities in any medium.
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