Origin of Doppler effect
Words nearby Doppler effect
How to use Doppler effect in a sentence
In Israel, however, a new law took effect January 1st that banned the use of underweight models.How Skinny Is Too Skinny? Israel Bans ‘Underweight’ Models|Carrie Arnold|January 8, 2015|DAILY BEAST
But they say its effect on the regular daily operation of organized crime has been negligible.
All of these increased barriers then have a snowball effect.Random Hook-Ups or Dry Spells: Why Millennials Flunk College Dating|Ellie Schaack|January 1, 2015|DAILY BEAST
So now the company is asking the FCC to, in effect, reverse itself.How ‘Ethical’ Hotel Chain Marriott Gouges Guests in the Name of Wi-Fi Security|Kyle Chayka|December 31, 2014|DAILY BEAST
A revised version of the law goes into effect on January 1st, 2015.Propaganda, Protest, and Poisonous Vipers: The Cinema War in Korea|Rich Goldstein|December 30, 2014|DAILY BEAST
In this case, I suspect, there was co-operant a strongly marked childish characteristic, the love of producing an effect.
He shrank, as from some one who inflicted pain as a child, unwittingly, to see what the effect would be.
And so this is why the clever performer cannot reproduce the effect of a speech of Demosthenes or Daniel Webster.Expressive Voice Culture|Jessie Eldridge Southwick
The well-known "cock and bull" stories of small children are inspired by this love of strong effect.
She stabbed him, noting the effect upon him with a detached interest that seemed indifferent to his pain.
British Dictionary definitions for Doppler effect
Word Origin for Doppler effect
Medical definitions for Doppler effect
Scientific definitions for Doppler effect
A Closer Look
The whistle of an approaching train has a higher pitch as the train approaches than when it recedes, even though that same whistle, heard by a passenger on the train, maintains a constant pitch. This is an example of the Doppler effect, common to all wave phenomena (in this case, a sound wave). Motion toward the source of a wave (or, equivalently, motion of the source toward the observer) entails that the peaks and troughs of the wave are encountered more quickly than if there were no motion, so the frequency of the wave is higher for the moving observer (hence the higher whistle pitch). Similarly, motion away from the source entails following the wave's motion, so the peaks and troughs are encountered less often, and the frequency is lower for the moving observer (hence the lower whistle pitch). The Doppler effect on light waves has enabled scientists to determine that the universe is expanding. The frequencies of light given off by various substances (such as the burning of hydrogen in the fusion reactions of most stars) has been found to be lower in distant galaxies and other celestial objects, a phenomenon called red shift, since the visible light is shifted toward the red, low-frequency end of the spectrum. Astronomer Edwin Hubble reasoned that the red shift was due to the Doppler effect. As galaxies speed away from us, the frequency of the light emitted appears lower. Doppler radar and sonar use the Doppler effect on reflected radio and sound waves to distinguish between stationary and moving objects and to determine the velocity of moving ones; the echolocation of bats and some whales also exploits the Doppler effect on reflected sound waves for navigating and catching prey.
Cultural definitions for Doppler effect
A phenomenon observed with waves. The frequency of a wave of light or sound seems higher if the source is moving toward the observer and seems lower if the source is moving away. For example, if an automobile blows its horn as it travels past someone, the apparent pitch of the sound will be higher as it approaches the person and then will grow lower as it passes and moves away.