Assertion: doppler effect | /r/HasProperty | the difference
Facets:
value: between the observed frequency
type: OTHER
value: according to christian doppler
type: OTHER
value: to cosmological redshift
type: OTHER
Source sentences:
text: The Doppler effect (or Doppler shift), named after Austrian physicist Christian Doppler who proposed it in 1842, is the difference between the observed frequency and the emitted frequency of a wave for an observer moving relative to the source of the waves.
text: Doppler shift is different to cosmological redshift, which is caused by the expansion of the Universe, and gravitational redshift which is due to a strong gravitational field causing a photon to lose energy before it reaches us.
text: This is due to the fact that the Doppler shift, i.e the difference between the emitted and reflected sound waves, falls within the frequency range that humans can hear.
text: According to Christian Doppler, the Doppler Effect is the difference between the observed frequency and the emitted frequency of a wave for an observer moving in relation to the wave source.