Doppler effect

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Due to the Doppler effect, a fire truck's siren gets higher-pitched as it travels closer and sounds lower-pitched as it drives farther away.

From Science Daily

Keck Observatory on Hawaii's Mauna Kea, they could detect slight variations in stellar motion via the redshift and blueshift of the Doppler effect -- which helped them determine planetary mass readings of unprecedented precision.

From Science Daily

In contrast, ultrasound imaging, considered safe enough for fetal monitoring, utilizes the Doppler effect to measure real-time blood flow velocity and direction without the need for contrast agents.

From Science Daily

Their speeds would be carefully calibrated to create different layers of the Doppler effect, or the bending in a note that we perceive when sound passes us by.

From New York Times

Sometimes I go to sleep to the bizarre Doppler effect of planes that sound as if they’re about to crash into my house.

From Seattle Times