Which is same for all kind of electromagnetic waves?
Frequency , speed , energy

I would say speed, They can have different frequency and energy. Speed would be the same for all.

All of those three things can change.

I would believe Capichun, but if 1 was the answer, I would chose speed.

Yes, the speed of an EM wave is fixed when traveling through a particular medium. The change in speed is not a property of the wave, but of the material.

You should point out to your teacher that EM waves can move at different speeds if they are in different media, though :)

Speed of EM waves depend on permitivity & permiability of the medium.And if frequency is constant energy is also constant.But frequency depends on speed which in turn depends on the medium of propagation

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Originally Posted by Stratmando

I would say speed, They can have different frequency and energy. Speed would be the same for all.

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Speed depends on medium and , frequency and energy depends on speed

In Vacuum, all of them are same speed, but other medium speed different