The statement that should be compared the speed of the waves should be option A.
What is the speed of the waves?
Wave speed represent the distance where a wave travels in a given amount of time, like the number of meters it travels per second. Wave speed should be related to wavelength and wave frequency by the equation i..e
Speed = Wavelength x Frequency.
Here the particles in solid should be considered more tightly bound together as compared to the particles in gases. Also, the electromagnetic waves do not need the medium for pass via at the time when it should be quicker as compared to the fewer particles.
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