what is transferred by a mechanical wave?
water waves & sound waves
...not really sure what you mean though, but I'll go with Tomas on this one.
The wave is the energy or product of some energy force. A wave of Photons moving through a sea of electron-positron pairs would continue on indefinitely giving off no energy until it hit something; Then it would not be a wave. SEE: Dirac Equation Quantum Physics...
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