FariÃ±a grew up in Brooklyn, the daughter of two Spanish immigrants who spoke that language at home. At Monday's press conference, she told a story of a postcard that her father, who she said had a third-grade education and taught her about the importance of education, received in the mail from her school.
The Doppler effect is the apparent shift in wave frequency due to the movement of a wave source. The apparent frequency shifts upward when the wave source is approaching and downward when the wave source is retreating. The Doppler effect explains why we perceive a change in pitch of the sound of a passing siren.
There are many more things we can learn using the Doppler Shift, and here is a summary of just a few: 1  We can measure the masses of binary stars, by detecting the velocity changes as they orbit around their common center of gravity, and combining these velocities with the period of the orbit.