Assertion: doppler effect | /r/CapableOf | hold true
Facets:
value: because of einstein's theory
type: CAUSE
value: because of relativity
type: CAUSE
Source sentences:
text: Although first discovered for sound waves, the Doppler effect holds true for all types of waves including light and other electromagnetic waves (though for electromagnetic waves - because of Einstein's theory or relativity - only the relative velocity matters and it is immaterial whether the source or the observer is moving).